Cant assign ZMIN_HEAD as a Date Profile in ZMIN Transaction

I´m using a ZMIN and I want to custom a DATE PROFILE to use customs date fields.

I have configured the date profile in customizing

BUT, I can´t see this fields in the DATE block in SM_CRM (Transaction ZMIN)

After a bit of investigation, i,ve notice that the DATE profile of ZMIN by default is SMIN_ITEM.

Where can I change this DATE profile, because in customizing I can´t see this parameter.???

Thank You!

Federico Iglesia