The Internal Purchase Order (IPO) Document Code records encumbrances for internal purchases. The appearance of the document is very similar to the GAE, but with an expanded vendor line to collect optional COA for the seller.
The IPO Document Code contains the same fields and sections as the IRQ Document Code.
Please refer to the "Internal Requisition (IRQ)" and "General Accounting Pre Encumbrance (GAP)" sections in this guide for screen shots and field definitions.
The "Create a Non-Commodity Order" section contains instructions on creating a GAE document.