PAY_TRAN_SOURCE is a field which displays the source of the transaction. Pay_Tran_Source is for viewing only, you may not edit information found in this field.

X_PAY_TRAN_SOURCE is a fixed lexicon with the following values:
Saved
Value
Displayed Value
02 IPTR Screen
03 UPTL Loader
04 UPTG Generator
05 External Source
06 UTTG Generator
07 Web Self Service
08 Autofill
09 UPCPAY Generator
10 UPPAL Generator
11 UPGTS