AR-E ...A statement for ACME shows they owe us $1000.00 and everything is current
AR-F ... An aging for ACME shows they owe us $950.00, everything is current , but there is a msterious credit referencing inv#75 for $50.00 in the over 90 days amount
 
At first glance of AR-F, one would think that ACME paid us twice for inv#75, but they didnt.     AR-E, the statement is correct.  AR-F, the aging is incorrectly showing a credit with an inocent invoice number.
 
How did this mysterious credit get on AR-R.....Any ideas, all help is appreciated.
Thanks,
 
P.S.  names, dates, amounts, and invoice numbers have been changed to protect the innocent.

AR Aging can be tricky to clean up.  The files you need to look at are BKART and BKARINVT.