Why would a distribution change on a zero-dollar invoice cause a DR entry to be made to a cash accou

We made a distribution change to a zero dollar invoice in December - by change meaning discarding a line and creating a new line with the correct distribution information.  This invoice was cleared via a zero dollar payment in July.

Once Create Accounting ran after the invoice change, it created a DR entry (JE Source=Payables; JE Category=Payments) to our cash account.

Why would a distribution change on a zero-dollar invoice cause a DR entry to the cash account.  I tried all the diagnostic tools available including Invoice Data but I don't see where this entry could have come from.  The online Line Drilldown functionality just points me back to the actual payment record but doesn't show details of this entry.