Can you please share test scripts of other finance modules, in case you have the same?
Analyze the issue from front end. Find Set of books corresponding to 1001 & 1004 & query the required prepayment/invoice data in forms, then...
Entering and Processing Replenishment Counts
Disabling a Lot
INV-Defining Transaction Types
Defining Transaction Reasons
Defining Stock Locators
Defining Shortage Parameters
Defining Shipping Methods
Defining Recommended Categories
Defining Picking Rules
Defining Pick Slip Grouping Rules
Defining Organization Access