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Don\'t worry. The WAC# has nothing to do with your FP. Only the A# is used during your FP processing. You may have different WAC# for 485, 765 and 131. But you can have only ONE A#.
When you go to INS/ASC for taking FP, they will only ask you for A#.
When you call FBI to check your FP status, the officer will only ask for A# too.