For modification transactions, what amount is defaulted to the Amount of Initial Advance in the For Lender's Use section of the Credit Application Real Estate on the Document Data page?

The amount defaulted to this field is the difference between the Current Balance and the Loan Amount from the Calculations page when the Current Balance is less than the Loan Amount.

The amount will stay current based on the values on the Calculations page until the amount is changed on the Document Data page within the Credit Application Real Estate.