I know which BAPI to use to create a relationship between BP's, but, do I have to build the relationship in both directions, or is that already taken care of?. For example, If I build a relationship between Premise and Occupier (Ship-to) do I also need to built a relationship from the Occupier back to the Premise as well, so that if I happened to search and find the occupier then it will point to the premise.
BAPI planned to use is BAPI_BUPR_RELATIONSHIP_CREATE.
I'm loading the BP's first and then once checked/confirmed then building the relationships. Ideally, just in one direction, depending on the answer to the above question.
Have not loaded the BP's yet, so expecting fun. Any advice from someone having loaded BP's into CRM 7 would much appreciated. 
Regards
Gary King