Adding a custom partner Z field as a complaint search criteria

Hello,

i would like to define an existing custom Z field ZZFLD000054 from CRMD_PARTNER as the complaints' search criteria (component = BT120S_CPL, view = AdvSearchCompIEF). If the user enters a value into this new search field, SAP should return a list of complaints, that include partners that have this value in the Z field.

I added this Z field into a SEARCH node of the view (Add Model Attribute, BOL entity = BTPartner, BOLAttribute = ZZFLD000054), but the problem is the field is not available in the Configuration.

Please help!