Hi Eric3
We've seen that this 'false' message may be generated indicating that too many transactions are selected when processing an electronic payment, however, the ABA file would still be generated and all payments included.
This message will generally occur when you select one or more transactions in the Prepare Electronic Payments window, close the window without generating the ABA file then return later. We do recommend that if you are not generating the ABA file at that time then don't tick those transactions, this has been known to prevent that message from being generated.