Multilevel Categorization - Service Request Item level

Hello Friends,

We created two multilevel categorization schema. One at service request header level and other at service request item level. In header CAT1, CAT2, CAT3 etc drop down fields are in edit mode. But in Item level CAT1, CAT2, CAT3 etc drop down fields are read only mode. In debugging I changed the field property in GET_I method then fields are in edit mode but drop down values are missing.

Please let me know if I am missing any configuration step or can we make CAT1, CAT2, CAT3 etc drop down fields as editable using ABAP code.

Thanks.

Naveen.