Descriptive Flex Field for Suspense Code

in Oracle R12 I need to remove / add a few values in the suspense code dff, however, I am not able to find it.

The dff I am talking is located at AR--> Transactions --> Transactions Summary --> query a transaction --> Installments --> enter disput amount and date. There is a dff next to dispute date with the name as 'Payment Schedule Information'.

When I go and check the DFF definition I find this as under:

Application: Receivables

Title : Payment  Schedule Information

Segment: SUSPENSE CODE

Value Set: GTAA_AR_SUSPENSE_CODES

When I try to find the values I get nothing.