have you checked the guide here.
help.sap.com/cloud4hr.
can you paste the entire error , as dont know for which field its giving error?
for example a typical scenario
Go into the generic object ''Division'' and establish at the end of the edit page an One-to-One association with ''Cost Centre''. Then go into each Division that you have in the system, edit, and you will see Cost Centres at the bottom and you can select which Cost Centres should be displayed when this particular Division was selected.