If you select Natural Application = Yes and Allow Overapplication = No, the only application that you can make to a transaction (positive or negative) is to reduce the balance closer to zero.
If you select Natural Application = No and Allow Overapplication = Yes/No, you can overapply transactions and reverse their signs, if necessary.
After the merge of Pacific Express into ACME, the invoice that includes both the 100 California bill to and ship to addresses is transferred to the 255 Market site for both the bill to and ship to addresses. The receipt for the 55 Mission site bill to address is transferred to the 38 Telegraph bill to address.