How do I get rid of old bill due reminders? Aging part of customer reports, statements?

[John Griessen]

There seem to be many left over after paying from customer with an amount 
greater than on invoice -- paying for several invoices at once.   Then some say 
they are due still.

is there a pattern I can search and replace in the .xac file of gnucash to kill 
those reminders?


Also, the aging summary on customer and vendor reports is always off...
Where is the source file for vendor and customer reports so I can take that off?

thanks,

John G

PS  Not interested in "How I should have done it long ago...".