Thank you very much Suresh,
actually Im using the flow of 0REFX_C07, however i dont know the relationship between father(Pool Spaces) and child (rental Object).
I mean
in R3
father -> PS 1000
childs -> RO 1001
RO 1002
RO 1003
but in BW, if i take the RO 1002, i cannot see what PS it belongs to.
also i tried to activate the standard transfer rule, but i doesnt exist for this DS (0REOBJECT_HIER)
I think, the only solution could be an enhancement to the attributes DS.
thanks a lot.