The issue lies in not adhering to the principles of "Double-entry bookkeeping." While it's understandable that many technical professionals might not be familiar with this concept, I believe every NAV developer should have a basic understanding of accounting principles. You can find more information about it here.

In simple terms, when you move money from account 8720, you need to specify where the money is being moved to. According to double-entry bookkeeping, if you credit (or debit) account 8720, you must also indicate which other account will be debited (or credited).

There are two ways to do this:

1. Populate the "Bal. Account Type" and "Bal. Account No." fields for that line.
2. Add a second line with the opposite amount in the amount field.

I hope this clarifies things!