11.5.10.2 - Tips on API's in Purchasing
Note ID 359295.1 - Oracle® Purchasing Release 11i10 Open Interfaces and APIs Note provides details on the open interfaces and API in Purchasing for import of data into Purchasing.
Nite ID 1078842.1 - Vision Demo - How To Use the PO Change API To Update Existing Purchase Orders
Note ID 1077153.1 - Vision Demo - How To Use the Cancel PO API
Hope this is helpful
Regards
Kavita