Credit transaction is given value of $0

Overview: After creating a credit invoice for -$26 and paying the invoice. A credit transaction was applied to the Fund for $0.

Steps to Reproduce:

1. Log into some folio-snapshot
2. Create a POL with at lease one Fund distribution
3. AND a cost >0
4. Open POL
5. Create invoice based on POL and Pay invoice
6. Create second invoice based on POL AND add "-" to the invoice line subtotal
7. Total should be the inverse of the first invoice
8. Pay invoice
9. View Fund transaction list

Expected Results: Transaction list shows a Payment for X amount and a Credit transaction for X amount. As a result Expended = what it was before the Payment for invoice 1 was created.

Actual Results: Transaction list shows a Payment for X amount and a Credit transaction for 0. Expended still includes the amount of payment for invoice 1.

Additional Information: see screenshots. 

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