--Customer Record > Financial Tab > Default Receivables Account = AR Account 10002.
--Setup > Accounting > Accounting Preference > Item Preferences > Items/Transactions > Default Receivables Account = AR Account 10001.
A User enters an Invoice for the Customer. GL Impact shows that it hits AR Account 10003. None of the above setting was followed.
When the Invoice was created, AR Account (found in the Invoice Form > Accounting Tab > Account Field) was changed "on the fly" before the Invoice was saved or;
Invoice was created through Transactions > Sales > Invoice Sales Orders Page and AR Account 10003 was selected in the A/R Account Field before hitting Submit.