Dates is not editable in service request??

Hi all,

I customized date profile for my transaction type but the date is not editable in Web UI even if it's changble in GUI.

It remains the same by dooing below test:

Test1: Aassign standard profile IT0000000001 to my type.

Test2: Copy standard service request SRVR as ZZSR. Date of SRVR is filled automatically and changable but not for ZZSR.

Is there any key setting omitted?

Regards,

Felix