Default value for DFF at expense details

Summary:

Default value for DFF at expense details not working

Content (please ensure you mask any confidential information):

We have created Global segment dff at EXM_EXPENSES with
Data Type = number
Value set validation type = Format Only
Value Set Validation data type= Number
Default Type= Constant
Default Value= 0
However, we couldn't see default value at expense UI. Please help me out if am missing something or if this can be achieved with SQL, then please provide the SQL.
Note: We have also created same DFF at AP Invoice Line level to copy the same value from expense to payables.

Regards