Purchasing Ledger Update Business Function

I have a custom application that will update records on the purchase order detail file. I want to write a record to the PO Ledger and am looking for a business function to call. I've searched through the business functions and may not be searching correctly.

For the Sales Ledger, I've used Update F4211 Detail and F42199 Ledger (B4201220) so I was looking for something similar on the PO side. Is there a similar business function for system 43?

Thanks

version 9.2

Tools 9.2.3.5