Charles has made the most important statement on this (enforce database independance). Just two additional comments:
- the mistake was made at the beginning and its very simple to avoid it: you must not use any table (or PF) in any programm, only use Views (LFs)
- if the PO-Numnber would be part of a key in some table the situation would be complicated a lot. You could avoid this wit a simple rule: you must not use semantic keys.


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