Hi Mike,
There are no options for verification of dupliate payment numbers in Order Entry. OE generally isn't the primary point for cash entry in the system, and taking payments was designed for a one payment per document scenario, as you indicated.
If you know that a payment will cover multiple orders, perhaps you can use the 'auto-generate' option on the check number and deal with combining the payments in the AR cash batch. That's about it for what OE currently provides. There are no options for combining orders at this time.
Just curious, but how would a duplicate payment warning have assisted in your situation? If the same check number was used to pay for two separate orders, would you have entered 123a and 123b for the check numbers in OE, since the duplication was not an entry error but in fact the 'desired method of entry'?
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Regards,
Softrak Tech Support