EX-99 2 amac2003_13.htm EXHIBIT


WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: AMAC.0313
Distribution Date: 08/25/2004
 
Class Cusip Orig Prin Bal Begin Prin Bal Int Rate Accrued Int Rate Paid Int Dist Prin Dist Int Shortfall PPIS Uncomp Int Shortfall Prin Loss Deferred Interest Int Reimbursed Unsched Int Prin Reimbursed Subsequent Recoveries Total Dist Ending Class Bal
A1 000780NX0 $40,000,000.00 $30,670,838.33 5.5000000000% 5.5000000000% $140,574.68 $181,339.26 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $321,913.94 $30,489,499.07
A2 000780NY8 $28,373,000.00 $27,584,231.81 5.5000000000% 5.5000000000% $126,427.73 $114,756.44 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $241,184.17 $27,469,475.37
A3 000780NZ5 $24,249,000.00 $25,037,768.19 5.5000000000% 5.5000000000% $114,756.44 ($114,756.44) $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $25,152,524.63
A4 000780PA8 $29,323,850.00 $29,323,850.00 5.5000000000% 5.5000000000% $134,400.98 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $134,400.98 $29,323,850.00
A5 000780PP5 $2,210,139.00 $0.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
A6 000780PQ3 $207,487,020.00 $150,764,745.09 5.5000000000% 5.5000000000% $691,005.08 $891,386.39 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,582,391.47 $149,873,358.70
A7 000780PR1 $4,878,279.00 $4,878,279.00 5.5000000000% 5.5000000000% $22,358.78 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $22,358.78 $4,878,279.00
A8 000780PS9 $5,000,000.00 $3,633,112.70 5.2500000000% 5.2500000000% $15,894.87 $21,480.53 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $37,375.40 $3,611,632.17
A9 000780PT7 $500,000.00 $363,311.27 1.9500000000% 1.9500000000% $590.38 $2,148.05 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $2,738.43 $361,163.22
A10 000780PU4 $500,000.00 $363,311.27 6.0500000000% 6.0500000000% $1,831.69 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $1,831.69 $361,163.22
AP 000780PB6 $2,193,666.68 $2,154,148.76 0.0000000000% 0.0000000000% $0.00 $2,689.37 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $2,689.37 $2,151,459.39
AX 000780PC4 $236,623.75 $147,320.29 5.5000000000% 5.5000000000% $675.22 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $675.22 $145,681.47
M 000780PD2 $5,497,510.00 $5,451,292.84 5.5000000000% 5.5000000000% $24,985.09 $5,823.76 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $30,808.86 $5,445,469.08
B1 000780PE0 $2,128,068.00 $2,110,177.48 5.5000000000% 5.5000000000% $9,671.65 $2,254.36 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $11,926.01 $2,107,923.12
B2 000780PF7 $1,064,034.00 $1,055,088.75 5.5000000000% 5.5000000000% $4,835.82 $1,127.18 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $5,963.00 $1,053,961.57
B3 000780PH3 $709,356.00 $703,392.50 5.5000000000% 5.5000000000% $3,223.88 $751.45 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $3,975.34 $702,641.05
B4 000780PJ9 $532,017.00 $527,544.38 5.5000000000% 5.5000000000% $2,417.91 $563.59 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $2,981.50 $526,980.79
B5 000780PK6 $532,018.07 $527,545.43 5.5000000000% 5.5000000000% $2,417.92 $563.65 $0.00 $0.00 $0.00 $0.02 $0.00 $0.00 $0.00 $0.06 $0.00 $2,981.57 $526,981.82
R 000780PG5 $100.00 $0.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
R_SYN XXXXXXXXX $0.00 $0.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
Total   $354,678,057.75 $284,785,326.53     $1,296,068.12 $1,110,127.61 $0.00 $0.00 $0.00 $0.02 $0.00 $0.00 $0.00 $0.06 $0.00 $2,406,195.73 $283,675,198.96




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: AMAC.0313
Distribution Date: 08/25/2004
 
Class Orig Face Beg Bal Prin Loss Prin Reimbursed Subsequent Recoveries Deferred Interest Total Prin End Cert Pct End Cert Bal
A1 $40,000,000.00 $30,670,838.33 $0.00 $0.00 $0.00 $0.00 $181,339.26 0.7622374767 $30,489,499.07
A2 $28,373,000.00 $27,584,231.81 $0.00 $0.00 $0.00 $0.00 $114,756.44 0.9681554777 $27,469,475.37
A3 $24,249,000.00 $25,037,768.19 $0.00 $0.00 $0.00 $0.00 ($114,756.44) 1.0372602841 $25,152,524.63
A4 $29,323,850.00 $29,323,850.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $29,323,850.00
A5 $2,210,139.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 0.0000000000 $0.00
A6 $207,487,020.00 $150,764,745.09 $0.00 $0.00 $0.00 $0.00 $891,386.39 0.7223264313 $149,873,358.70
A7 $4,878,279.00 $4,878,279.00 $0.00 $0.00 $0.00 $0.00 $0.00 1.0000000000 $4,878,279.00
A8 $5,000,000.00 $3,633,112.70 $0.00 $0.00 $0.00 $0.00 $21,480.53 0.7223264340 $3,611,632.17
A9 $500,000.00 $363,311.27 $0.00 $0.00 $0.00 $0.00 $2,148.05 0.7223264400 $361,163.22
A10 $500,000.00 $363,311.27 $0.00 $0.00 $0.00 $0.00 $0.00 0.7223264400 $361,163.22
AP $2,193,666.68 $2,154,148.76 $0.00 $0.00 $0.00 $0.00 $2,689.37 0.9807594789 $2,151,459.39
AX $236,623.75 $147,320.29 $0.00 $0.00 $0.00 $0.00 $0.00 0.6156671509 $145,681.47
M $5,497,510.00 $5,451,292.84 $0.00 $0.00 $0.00 $0.00 $5,823.76 0.9905337289 $5,445,469.08
B1 $2,128,068.00 $2,110,177.48 $0.00 $0.00 $0.00 $0.00 $2,254.36 0.9905337235 $2,107,923.12
B2 $1,064,034.00 $1,055,088.75 $0.00 $0.00 $0.00 $0.00 $1,127.18 0.9905337329 $1,053,961.57
B3 $709,356.00 $703,392.50 $0.00 $0.00 $0.00 $0.00 $751.45 0.9905337376 $702,641.05
B4 $532,017.00 $527,544.38 $0.00 $0.00 $0.00 $0.00 $563.59 0.9905337423 $526,980.79
B5 $532,018.07 $527,545.43 $0.02 $0.06 $0.00 $0.00 $563.65 0.9905336862 $526,981.82
R $100.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 0.0000000000 $0.00
R_SYN $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 0.0000000000 $0.00
Total $354,678,057.75 $284,785,326.53 $0.02 $0.06 $0.00 $0.00 $1,110,127.61 0.7998103992 $283,675,198.96




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: AMAC.0313
Distribution Date: 08/25/2004
PER $1000 DENOMINATION
Class Orig Face Beg Bal Prin Loss Prin Reimbursed Subsequent Recoveries Deferred Interest Total Prin End Cert Pct End Cert Bal
A1 $40,000,000.00 766.77095825 0.00000000 0.00000000 0.00000000 0.00000000 4.53348150 0.7622374767 762.23747675
A2 $28,373,000.00 972.20004265 0.00000000 0.00000000 0.00000000 0.00000000 4.04456490 0.9681554777 968.15547774
A3 $24,249,000.00 1,032.52786465 0.00000000 0.00000000 0.00000000 0.00000000 -4.73241948 1.0372602841 1,037.26028414
A4 $29,323,850.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
A5 $2,210,139.00 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.0000000000 0.00000000
A6 $207,487,020.00 726.62253807 0.00000000 0.00000000 0.00000000 0.00000000 4.29610676 0.7223264313 722.32643131
A7 $4,878,279.00 1,000.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.0000000000 1,000.00000000
A8 $5,000,000.00 726.62254000 0.00000000 0.00000000 0.00000000 0.00000000 4.29610600 0.7223264340 722.32643400
A9 $500,000.00 726.62254000 0.00000000 0.00000000 0.00000000 0.00000000 4.29610000 0.7223264400 722.32644000
A10 $500,000.00 726.62254000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.7223264400 722.32644000
AP $2,193,666.68 981.98544913 0.00000000 0.00000000 0.00000000 0.00000000 1.22597021 0.9807594789 980.75947892
AX $236,623.75 622.59299838 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.6156671509 615.66715091
M $5,497,510.00 991.59307396 0.00000000 0.00000000 0.00000000 0.00000000 1.05934505 0.9905337289 990.53372891
B1 $2,128,068.00 991.59306939 0.00000000 0.00000000 0.00000000 0.00000000 1.05934585 0.9905337235 990.53372355
B2 $1,064,034.00 991.59307879 0.00000000 0.00000000 0.00000000 0.00000000 1.05934585 0.9905337329 990.53373294
B3 $709,356.00 991.59307879 0.00000000 0.00000000 0.00000000 0.00000000 1.05934115 0.9905337376 990.53373764
B4 $532,017.00 991.59308819 0.00000000 0.00000000 0.00000000 0.00000000 1.05934585 0.9905337423 990.53374234
B5 $532,018.07 991.59306751 0.00003759 0.00011278 0.00000000 0.00000000 1.05945650 0.9905336862 990.53368620
R $100.00 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.0000000000 0.00000000
R_SYN $0.00 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.0000000000 0.00000000




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: AMAC.0313
Distribution Date: 08/25/2004
 
Class Orig Face Int Rate Accrued Int Rate Paid Beg Cert Prin/Not Bal Current Int Accrued Int Shortfall PPIS Uncompensated Int Shortfall Unscheduled Int Int Reimbursed Total Int Dist
A1 $40,000,000.00 5.5000000000% 5.5000000000% $30,670,838.33 $140,574.68 $0.00 $0.00 $0.00 $0.00 $0.00 $140,574.68
A2 $28,373,000.00 5.5000000000% 5.5000000000% $27,584,231.81 $126,427.73 $0.00 $0.00 $0.00 $0.00 $0.00 $126,427.73
A3 $24,249,000.00 5.5000000000% 5.5000000000% $25,037,768.19 $114,756.44 $0.00 $0.00 $0.00 $0.00 $0.00 $114,756.44
A4 $29,323,850.00 5.5000000000% 5.5000000000% $29,323,850.00 $134,400.98 $0.00 $0.00 $0.00 $0.00 $0.00 $134,400.98
A5 $2,210,139.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
A6 $207,487,020.00 5.5000000000% 5.5000000000% $150,764,745.09 $691,005.08 $0.00 $0.00 $0.00 $0.00 $0.00 $691,005.08
A7 $4,878,279.00 5.5000000000% 5.5000000000% $4,878,279.00 $22,358.78 $0.00 $0.00 $0.00 $0.00 $0.00 $22,358.78
A8 $5,000,000.00 5.2500000000% 5.2500000000% $3,633,112.70 $15,894.87 $0.00 $0.00 $0.00 $0.00 $0.00 $15,894.87
A9 $500,000.00 1.9500000000% 1.9500000000% $363,311.27 $590.38 $0.00 $0.00 $0.00 $0.00 $0.00 $590.38
A10 $500,000.00 6.0500000000% 6.0500000000% $363,311.27 $1,831.69 $0.00 $0.00 $0.00 $0.00 $0.00 $1,831.69
AP $2,193,666.68 0.0000000000% 0.0000000000% $2,154,148.76 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
AX $236,623.75 5.5000000000% 5.5000000000% $147,320.29 $675.22 $0.00 $0.00 $0.00 $0.00 $0.00 $675.22
M $5,497,510.00 5.5000000000% 5.5000000000% $5,451,292.84 $24,985.09 $0.00 $0.00 $0.00 $0.00 $0.00 $24,985.09
B1 $2,128,068.00 5.5000000000% 5.5000000000% $2,110,177.48 $9,671.65 $0.00 $0.00 $0.00 $0.00 $0.00 $9,671.65
B2 $1,064,034.00 5.5000000000% 5.5000000000% $1,055,088.75 $4,835.82 $0.00 $0.00 $0.00 $0.00 $0.00 $4,835.82
B3 $709,356.00 5.5000000000% 5.5000000000% $703,392.50 $3,223.88 $0.00 $0.00 $0.00 $0.00 $0.00 $3,223.88
B4 $532,017.00 5.5000000000% 5.5000000000% $527,544.38 $2,417.91 $0.00 $0.00 $0.00 $0.00 $0.00 $2,417.91
B5 $532,018.07 5.5000000000% 5.5000000000% $527,545.43 $2,417.92 $0.00 $0.00 $0.00 $0.00 $0.00 $2,417.92
R $100.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
R_SYN $0.00 0.0000000000% 0.0000000000% $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
Total $354,678,057.75     $284,785,326.53 $1,296,068.12 $0.00 $0.00 $0.00 $0.00 $0.00 $1,296,068.12




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: AMAC.0313
Distribution Date: 08/25/2004
PER $1000 DENOMINATION
Class Orig Face Int Rate Accrued Int Rate Paid Beg Cert Prin/Not Bal Curent Int Accrued Int Shortfall PPIS Uncompensated Int Shortfall Unscheduled Int Int Reimbursed Total Int Dist
A1 $40,000,000.00 5.5000000000% 5.5000000000% 766.77095825 3.51436700 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 3.51436700
A2 $28,373,000.00 5.5000000000% 5.5000000000% 972.20004265 4.45591689 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.45591689
A3 $24,249,000.00 5.5000000000% 5.5000000000% 1,032.52786465 4.73241948 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.73241948
A4 $29,323,850.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333336 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333336
A5 $2,210,139.00 0.0000000000% 0.0000000000% 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
A6 $207,487,020.00 5.5000000000% 5.5000000000% 726.62253807 3.33035329 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 3.33035329
A7 $4,878,279.00 5.5000000000% 5.5000000000% 1,000.00000000 4.58333359 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.58333359
A8 $5,000,000.00 5.2500000000% 5.2500000000% 726.62254000 3.17897400 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 3.17897400
A9 $500,000.00 1.9500000000% 1.9500000000% 726.62254000 1.18076000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1.18076000
A10 $500,000.00 6.0500000000% 6.0500000000% 726.62254000 3.66338000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 3.66338000
AP $2,193,666.68 0.0000000000% 0.0000000000% 981.98544913 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
AX $236,623.75 5.5000000000% 5.5000000000% 622.59299838 2.85355971 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2.85355971
M $5,497,510.00 5.5000000000% 5.5000000000% 991.59307396 4.54480119 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.54480119
B1 $2,128,068.00 5.5000000000% 5.5000000000% 991.59306939 4.54480308 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.54480308
B2 $1,064,034.00 5.5000000000% 5.5000000000% 991.59307879 4.54479838 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.54479838
B3 $709,356.00 5.5000000000% 5.5000000000% 991.59307879 4.54479838 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.54479838
B4 $532,017.00 5.5000000000% 5.5000000000% 991.59308819 4.54479838 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.54479838
B5 $532,018.07 5.5000000000% 5.5000000000% 991.59306751 4.54480804 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 4.54480804
R $100.00 0.0000000000% 0.0000000000% 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
R_SYN $0.00 0.0000000000% 0.0000000000% 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2004 DISTRIBUTION REPORT
SERIES: AMAC 0313
WEIGHTED AVERAGE PC RATE: 5.46124%
WEIGHTED AVERAGE MATURITY: 349.21993
WEIGHTED AVERAGE LOAN AGE: 9.19227
POOL NUMBER: 2302
ISSUE DATE: 12/23/2003
CERTIFICATE BALANCE AT ISSUE: $354,678,057.76
  TOTAL NUMBER
OF MORTAGES
CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE)
CERTIFICATE BALANCE
OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END: 582   $284,785,326.52
PRINCIPAL POOL COLLECTION(S):      
Scheduled Principal Collection Due Current Month   $304,457.78  
Unscheduled Principal Collection/Reversals   $41,199.12  
Liquidations-in-full 2 $764,470.65  
Subsequent Recoveries   $0.00  
Net principal Distributed   $1,110,127.55 -$1,110,127.55
 
CAPITAL LOSS (PRINCIPAL WRITTEN OFF):     $0.00
 
BALANCE CURRENT FISCAL MONTH-END: 580   $283,675,198.97
 
SCHEDULED INTEREST AT MORTGAGE RATE:   $1,411,300.60  
 
UNSCHEDULED INTEREST AT MORTGAGE RATE:      
Unscheduled Interest Collection/Reversals   $0.00  
Interest Uncollected on Liquidation   $0.00  
Interest Uncollected on Non-Earning Assets   $0.00  
Interest Uncollected on Prepayment   $0.00  
Uncompensated Uncollected Interest   $0.00  
Net Unscheduled Interest Distributed   $0.00  
 
OTHER:      
Loan Conversion Fees   $0.00  
Expense Reimbursements   $0.00  
Gain on Liquidations   $0.00  
Hazard Insurance Premium Refunds   $0.00  
Recoveries Carried Forward   $0.00  
Net Other Distributions   $0.00  




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2004 DISTRIBUTION REPORT
  TOTAL NUMBER
OF MORTAGES
CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE)
CERTIFICATE BALANCE
OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:   $115,232.42  
 
UNSCHEDULED SERVICING FEES:      
Unscheduled Service Fee Collections/Reversals   $0.00  
Servicing Fees Uncollected on Liquidation   $0.00  
Servicing Fees Uncollected/Non-Earning Assets   $0.00  
Net Unscheduled Service Fees Distributed   $0.00  
 
MISCELLANEOUS EXPENSES:   $0.00  
 
NET FUNDS DISTRIBUTED:   $2,406,195.73  




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2004 DISTRIBUTION REPORT
SERIES: AMAC 0313
WEIGHTED AVERAGE PC RATE: 5.46124%
WEIGHTED AVERAGE MATURITY: 349.21993
WEIGHTED AVERAGE LOAN AGE: 9.19227
POOL NUMBER: ALL
ISSUE DATE: 12/23/2003
CERTIFICATE BALANCE AT ISSUE: $354,678,057.76
  TOTAL NUMBER
OF MORTAGES
CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE)
CERTIFICATE BALANCE
OUTSTANDING
BALANCES FROM LAST FISCAL MONTH-END: 582   $284,785,326.52
PRINCIPAL POOL COLLECTION(S):      
Scheduled Principal Collection Due Current Month   $304,457.78  
Unscheduled Principal Collection/Reversals   $41,199.12  
Liquidations-in-full 2 $764,470.65  
Subsequent Recoveries   $0.00  
Net principal Distributed   $1,110,127.55 -$1,110,127.55
 
CAPITAL LOSS (PRINCIPAL WRITTEN OFF):     $0.00
 
BALANCE CURRENT FISCAL MONTH-END: 580   $283,675,198.97
 
SCHEDULED INTEREST AT MORTGAGE RATE:   $1,411,300.60  
 
UNSCHEDULED INTEREST AT MORTGAGE RATE:      
Unscheduled Interest Collection/Reversals   $0.00  
Interest Uncollected on Liquidation   $0.00  
Interest Uncollected on Non-Earning Assets   $0.00  
Interest Uncollected on Prepayment   $0.00  
Uncompensated Uncollected Interest   $0.00  
Net Unscheduled Interest Distributed   $0.00  
 
OTHER:      
Loan Conversion Fees   $0.00  
Expense Reimbursements   $0.00  
Gain on Liquidations   $0.00  
Hazard Insurance Premium Refunds   $0.00  
Recoveries Carried Forward   $0.00  
Net Other Distributions   $0.00  




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
MASTER SERVICING
MORTGAGE PASS-THROUGH CERTIFICATES
08/2004 DISTRIBUTION REPORT
  TOTAL NUMBER
OF MORTAGES
CERTIFICATE ACCOUNT
ACTIVITY (@ PCRATE)
CERTIFICATE BALANCE
OUTSTANDING
SCHEDULED SERVICING FEE EXPENSES:   $115,232.42  
 
UNSCHEDULED SERVICING FEES:      
Unscheduled Service Fee Collections/Reversals   $0.00  
Servicing Fees Uncollected on Liquidation   $0.00  
Servicing Fees Uncollected/Non-Earning Assets   $0.00  
Net Unscheduled Service Fees Distributed   $0.00  
 
MISCELLANEOUS EXPENSES:   $0.00  
 
NET FUNDS DISTRIBUTED:   $2,406,195.73  




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: AMAC.0313
Distribution Date: 08/25/2004
 
Distribution by Group
Pool ID Principal Interest Total  
Pool - 2302 $1,110,127.55 $1,296,068.18 $2,406,195.73  
Aggregate $1,110,127.55 $1,296,068.18 $2,406,195.73  
 
Number of Loans and Aggregate Principal Balance By Group
Pool ID Beg Bal Beg Count Paid Off / Liq Count Rem Count Sched Prin End Bal Sched Prin Prin PrePay / Liq Unsched Prin / Rev Total Prin
Pool - 2302 $284,785,326.52 582 2 580 $283,675,198.97 $304,457.78 $764,470.65 $41,199.12 $1,110,127.55
Aggregate $284,785,326.52 582 2 580 $283,675,198.97 $304,457.78 $764,470.65 $41,199.12 $1,110,127.55
 
Delinquency Information by Group
Pool ID 1 Month Count Sched End Balance 2 Months Count Sched End Balance 3 Months Count Sched End Balance 4 Months Count Sched End Balance  
Pool - 2302 4 $1,974,339.76 0 $0.00 0 $0.00 0 $0.00  
Aggregate 4 $1,974,339.76 0 $0.00 0 $0.00 0 $0.00  
 
Foreclosure and REO Information by Group
Pool ID Foreclosure Count Sched End Balance REO Count Sched End Balance
Pool - 2302 0 $0.00 0 $0.00
Aggregate 0 $0.00 0 $0.00
 
Aggregate Loss Amounts by Group
Pool ID Count Loss Amount  
Pool - 2302 0 $0.00  
Aggregate 0 $0.00  




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: AMAC.0313
Distribution Date: 08/25/2004
 
INSURANCE RESERVES - Group 1
Insurance Type Original Balance Claims In Progress Claims Paid Coverage Adjustments Coverage Remaining
MPI $0.00 $0.00 $0.00 $0.00 $0.00
Special Hazard $2,057,133.00 $0.00 $0.00 $0.00 $2,057,133.00
Bankruptcy Bond
Single-Units $50,000.00 $0.00 $0.00 $0.00 $50,000.00
Multi-Units $0.00 $0.00 $0.00 $0.00 $0.00
Mortgage Repurchase $3,546,780.00 $0.00 $0.00 $0.00 $3,546,780.00
 
INSURANCE RESERVES - Aggregate
Insurance Type Original Balance Claims In Progress Claims Paid Coverage Adjustments Coverage Remaining
MPI $0.00 $0.00 $0.00 $0.00 $0.00
Special Hazard $2,057,133.00 $0.00 $0.00 $0.00 $2,057,133.00
Bankruptcy Bond
Single-Units $50,000.00 $0.00 $0.00 $0.00 $50,000.00
Multi-Units $0.00 $0.00 $0.00 $0.00 $0.00
Mortgage Repurchase $3,546,780.00 $0.00 $0.00 $0.00 $3,546,780.00




WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.
Series: AMAC.0313
Distribution Date: 08/25/2004
 
The Subordinate Certificates provide, to the limited extent described in the Prospectus Supplement, credit support, as well as special hazard, bankruptcy, and fraud coverage to certain Certificates. The "Prospectus Supplement" is that certain Prospectus Supplement, dated December 23,2003 to that certain Prospectus Supplement, dated January 23,2003, to which certain certificates were offered. The special hazard, bankruptcy, and Fraud coverage (collectively, "Credit Enhancements") provided by the Subordinate certificates provide coverage to the Loans, subject to the conditions and limitations to payment specified thereunder.
 
The Class Principal Balances of each Class of the Class M,B1,B2,B3,B4,B5 Certificatesimmediately after the principal and interest distribution on 200408 are as follows:
Class Class Principal Balance
M $5,445,469.08
B1 $2,107,923.12
B2 $1,053,961.57
B3 $702,641.05
B4 $526,980.79
B5 $526,981.82
Total $10,363,957.43
Capitalized items used but not defined herein have the meanings ascribed to them in the Prospectus Supplement.
The amount of the special hazard coverage, bankruptcy coverage, and fraud coverage, as of the above referenced distribution date, is $2,057,133.00, $50,000.00, $3,546,780.00 respectively, and such coverages are referred to in the table above under the column "Insurance Type" as "special hazard," "bankruptcy bond," and "mortgage repurchase," respectively. However, no policy of insurance exists for any such coverage, notwithstanding the reference to "insurance."