In the Accounting section, enter Yes for each header (not each line). Once the requisition is created, this will run the process that calculates the recoverable and non-recoverable tax and derives the charge account for a requisition. To assist with only populating the header row you can use the default row 10. This will populate the correct header row automatically on validation/upload.
Note: if your requisition has multiple lines then you need to place a Yes at the top line only. If you enter it for each line, then you will get an error “Section Accounting record in row xx is orphaned. Possible causes include a missing parent record or blank row gaps(s) above the current record”.