Restriction for drop down values for Cost Element Categeories

Hi

In MDG-F I want to process only secondary cost elememt. For this  for cost element catageories I want to restict values for secondary element only

But I found that in data element KATYP these values are defined as fixed values. Moreover there are seperate transactions (KA01/KA06) to create primary/secondary cost element but in case of MDG it is only one step.

Any workaround to achive this?