X_PAY_HEADER_SOURCE is a fixed lexicon with the following values:

Saved
Value
Displayed Value
01 IPPH Screen
02 IPTR Screen
03 IPTL Loader
04 UPTG Generator
05 External Source
06 UPCPAY Generator
07 UPRETRO Pay
08 UPCVAC Vacation Pay
09 UPVEND Proc Vendors
10 UPTL Loader
11 Final Pay
12 UPCTSP Generator
13 UPDISBV