When you apply a vendor prepayment, the Bills subtab on the Vendor Prepayment Application page shows the bill amount at the time of application. However, a user or process can update the bill amount after the application, changing the amount that is effectively applied.

Consider the following scenario:

1. Mark, who works in Purchasing, fully applies a vendor prepayment against a bill of 100.

2. Later on Lisa, who works in Accounting, changes the bill value from the original 100 to 50.

3. When Mark reviews the vendor prepayment transaction, he can see the status is Fully Applied. However, the applied amount is lower than the corresponding prepayment amount.

In this example, NetSuite updates the vendor prepayment application considering the new value of the bill. After updating the bill value, the 50 that were initially applied are credited to the vendor. When you pay a bill to the same vendor, you can see the credited amount under the Apply subtab.