Tax identification numbers marked as required on WebUi

Hi,

I have a requirement to make tax identification number required for a specific Business Partner Role.

Identification number is inside an assignment block of type table. So I am not able to set it as required using the screen configuration.

I tried to set the field mandatory on transaction BUCG, but it does not works on webUi either.

Is there any other option to achieve this requirement without development?

Thanks