Configure field selection for equipment user-fields

Hi everybody.

After follow and deploy the helpful guide from @Jogeswara Rao Kavala available here in SCN (http://scn.sap.com/docs/DOC-54073#), I have one additional question: after creation of user-field, Is it possible, even using ABAP, to configure field selection for the new user field?

I've attached few pictures to make myself clear.

Thanks in advance.

Carlos Araujo