Most of the time, Openbox works out automatically which arrays apply to which calculations. But sometimes, it is not clear what it should do.

This is particularly true for balances. If a balance has an opening balance input that varies by (say) region, then all inflows and outflows should also vary by region. If they do not, there is an inconsistency which needs to be resolved. 

Change the arrays for the opening balance and flows so they are consistent.