How to Prevent users from selecting an incorrect offset account for bank transfers?

Dears,

Good day.

We have modified the SLA for the offset account related to the bank transaction event to ensure it is treated as a constant account combination. Accordingly, if a business user enters any account combination, the system will now generate the accounting entries based on the modified SLA.

However, we have observed that the External Transaction screen still reflects the incorrect account combination entered by the business user.

Our customer has requested one of the following solutions:

Restriction Option: Prevent users from selecting an incorrect offset account for bank transfers. The screen would display a default value that cannot be changed by the user (applicable for bank transfers only).