as is my M.O., crude but workable ... sigh.

I'd still like to understand the dynamics of @Save and FormCommit and 'on element change'.  Is it possible that what was happening was the 'on element change' programming fires when the focus leaves POLinesYN, then the focus is thwarted from going to a new record from the last record of the set, because it's forbidden by NotifyForm(7), and so the focus is sent back to POLinesYN, where it tries to make another pass through the code?

Sorry to be so wordy!