Recently my A/P Aging shows a balance due to a vendor that is paid and does not match my GL. Now I have a Credit balance due to an A/R customer that has disappeared from my A/R aging & now does not match my G/L. How do I go about correcting the Aging reports? Everything else is correct, just the reports are off.

The amount is off only by by aging reports. The A/P check was saved as a printed check, and does not show as an amount due to the vendor anywhere except on the aging . The same goes for the A/R. The balance as a credit was there on last months aging. Now it is missing on the aging , but shows as a credit due on the customer account. I'm thinking I may just need to reindex the files, but DBA is very unclear how to do this.

I tried UT-K-D and no luck. I have also tried to reindex just the A/P Files amd no luck.  
The A/P aging is showing 2 check numbers that have been paid and posted to the check register as the invoice #. These two check numbers are showing on the aging only as unpaid invoices. Does anyone know with file I might try to re index the aging file? Again the balance due to the vendor is 0.

Actually, the 2 files to look at are BKAPINVT & BKAPCHKH.  The invoice is in BKAPINVT and the corresponding payments in BKAPCHKH.  If they get out of synch, you can see things on the Aging that are actually paid.  Reindexing alone will probably not correct it; you will need some behind the scenes manipulation.