R12 Payables: AP events unprocessed but new header is created

Is the most important lesson from the article "R12:AP/XLA: Event Left Unprocessed and Creates a New Header Each Time Invoice is Attemped for Accounting" on MOS via document ID 2097911.1 that a custom object is at fault here?  No!  The most important lesson is the referenced documents to learn something more that might be able to be applied later when you have a problem with the AP or XLA modules!