I forgot to mention ... your example shows for the check number field an entry like "1466 - BP#"

I don't know if that was an example of how to enter alpha characters, but as I mentioned earlier, we do not know what check # the bank will use on the Bill Pay when they send out checks until early in the next month when we get the bank statement.  We obviously are not going to wait to enter Bill Pay transactions until the following month, that would be ridiculous.  So we need to enter timely when the Bill Pay is scheduled, and simply entering the term BILLPAY is sufficient to identify the transaction.  It would be nice if the bank would allow us to choose each Bill Pay "check" number, but no bank I know of does that.  I'm sure they need to have a consistent and traceable ID for their internal purposes.