I had a similar problem with the cash receipt window. Receivable module set-up had the PMT next number as 9374. Ran this (select * from RM00401 where RMDTYPAL = 9 order by DOCNUMBR desc) and found that the last number was indeed 9999. In the module set-up I changed the 9374 to 10000. And the problem went away. GP has this habit of resetting next numbers it seems.
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