AP Invoice Interface; CONTROL_AMOUNT issue

This question is related to AP Invoice Import (R12) using the interface tables.  Our supplier will provide us with AP invoices.  These will be NON PO based invoices.  These invoices will contain both the Item amount and the tax amount.   We have EBTax implemented.  We would like the system to derive the tax information based on the “Ship To Location Code” on the invoice line and the TAX amount to be exactly equal to the amount provided by the supplier.

For this we have done the following:

- We created an ITEM line.

- Populated the “Ship to Location Code”   in the interface invoice line (AP_INVOICE_LINES_INTERFACE.SHIP_TO_LOCATION_CODE) so that the system derives correct TAX information (TAX rate Code etc.).