POs can be created is a variety of ways. Some are created automatically via interface upon contract award as is the case with SPS, LMP, DMLSS. AXOL and MIPR obligations are automatically posted after fund certification and acceptance respectively.
When errors occur between interfaces POs may need to be manually posted by the Purchase Order Processor. Like the PR the different PO types require different mandatory fields. Once the PO is created receipt of goods and invoice can successfully post in GFEBS.