This related to GP10 SP2, eConnect 10 SP2
I just spent 6 hours troubleshooting an unbelievably obscure eConnect error / bug, so I thought I would share.
A PO integration that has been working fine processing several thousand transactions over the last 5 months suddenly gets this error when trying to import a Drop Ship PO:
Cannot insert the value NULL into column 'CONTACT', table 'PROD.dbo.POP10110'; column does not allow nulls. INSERT fails.
The statement has been terminated.