message control for FTR_ASSGNMENT in OBA5

Hi ,

In Facility ,when we create a transaction to withdraw the amount

above the credit limit, system is throwing a warning message. However, when I

tried to modify the message from Warning to Error it did not allow

andits throwing a message “No control of message possible for work

area FTR_ASSIGNMENT”. We want to change the control message in OBA5,and

make the message of error type.

Is it  possible  to   change message control. for FTR_ASSIGNMENT. Please explain how it can be done.

Thanks,

Kamala.