Oracle Purchasing enables you to import purchase orders and agreements. You can:
Import price or sales catalog information and responses to requests for quotation (RFQs) electronically from suppliers in the form of blanket purchase agreements or catalog quotations.
Import standard purchase orders from legacy systems into Oracle Purchasing.
Import contract purchase agreements from legacy systems into Oracle Purchasing
Update or create complex purchase orders.
See: How to Import Complex Purchase Orders Using the Purchase Document Open Interface PDOI, My Oracle Support Note 1367326.1