Comment 3 for bug 2009066

Tiffany, I can't really think of such a situation, so here's a branch that makes the foreign key relationship deferrable, like that between acq.fund_debit and acq.po_item.

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/dyrcona/lp2009066-acq-invoice_item_fund_debit_fkey-deferred

I have also targeted this at rel_3_9 and rel_3_10 because I consider it a bug in the schema.