Hi,
Look at data distribution set rules for Functional location and Equipment at MDO objects level in syclo/config. panel. a) Either it could be b,cos of missing of user parameter value or b) wrong filters c) check if data exists for the filters you have set.
Best way to check this out is by executing BAPI wrapper for Functional location and Equipment on SAP side. That should give you some clue as to where the things are going wrong.
Thanks
Manju.