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Re: Duplicate AP invoices (per vendor)

Vendor invoice numbers are external data thus will not
always follow any constraints we dictate.

But it is a common constraint and where it fails A/P
people seem to come up with a unique-ifying suffix.

By nature, I like a clean and formal solution: (1) vouchers
which demote vendor invoice numbers to unconstrained
reference numbers or (2) formalizing the tie-braking to 
a constraint on company/invoice_no/date/disambiguater.  
But it is not that important.

It is a bad idea to have this constraint as an
administrative toggle.  Chris is right; this is an
modification of which to be wary.  It is not that
important, but it can promote user confusion.


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