Able to apply transactions after all or nothing operation was performed

Overview

The invoice-transaction-summary specifies the number of expected payments/credits for a given invoice. Once that number of payments/credits are received for that invoice, they're all applied at once in a db transaction. However, it's possible to post additional payments/credits and once that count is reached again, these new payments/credits are applied.

NOTE: It's likely that the same issue exists for other all-or-nothing operations, e.g. related to encumbrance creation (both invoice and orders) and updates. This bug covers them all.

Expected

Once all the payments and credits are applied for a given invoice, subsequent payments/credits for that invoice should be rejected with an appropriate error message/code

Actual

It's possible to post additional payments/credits and once that count is reached again, these new payments/credits are applied.

See comments in MODFIN-71 for an example of this.

Acceptance Criteria

• the module behaves as described in the expected section above
• unit tests are updated