[WebERP-developers] Shall we prevent a duplicate even multiple credit for the same invoice?

[ExsonQu <hex...@gm...>]

*Dear all:*

         I've noticed that if we choose credit in customer inquiry screen,
the same transaction is allowed to credit again and again. It'll leads to
qtyinvoiced become negative in some situation. 

         I think this behavior is not allowed. Since we have another scripts
SelectCreditItems.php to credit without any goods return or invoice etc.

        And I've noticed that some place only show errors without preventing
invoice processing. 

         Any comments are highly appreciated!

         Thanks and best regards!

         Exson



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