How to activate IBAN for a specific Personnel Area and Personnel Subarea

Hi Gurus,

We have a requirement to Activate IBAN in Infotype 9 (Bank Details).

It must be activated for a specific Personnel Area and to all Personnel Subarea under.

I have configured it in Table T588M, but when testing it the IBAN field/button is not visible to all Personnel Subareas.

What am I doing wrong? How do I make it available to all Personnel Subareas?

Thanks!