Understand complex datatype (structures) restrictions and limitations.
Instead of having multiple parameters reference the same MBO, copy and paste the structure object so that each reference is to a single structure object.
"Structure type:'' < structure_name > '' can''t be deleted, because it is still referenced by personalization key : '' < PK_name > ''".A Cut operation in the object diagram or Delete operation generates a similar error message if it is still referenced by a parameter or other structure.