Mandatory field "Priority" for maintenance plan

Hi,

Setting mandatory fields on preventive maintenance plan is not possible in customizing.

So the alternative are:

     - User-exit as described above (TCode SMOD)

     - Transaction variants (TCode SHD0)

I've tried SMOD: this approach is not a user friendly option. The user get an error but the field are greyed out and need to click on cancel before the are able to enter data.

So I triend the screen variant (SHD0). But I'm having an issue on the field "Priority" (RMIPM-PRIOK). The dropdownlist is not working...

Does anyone has a workaround? I want to avoid development...

Thanks,

Laura