>>select parent >>set relation to key into Child1 >>set relation to key into Child2 ADDITIVE >>set relation to key into Child3 ADDITIVE >>On Childs Define a composite index:
SET EXACT OFF INDEX ON fnToString(FKey)+DetailOrder1InStringFormat TAG BLABLA1 IN Child1 .... SET RELATION TO fnToString(Key) INTO Child1 IN Parent ADDITIVE ...If parent have 1 Record only, you can simplified:
INDEX ON ORDER DetailOrder1InStringFormat TAG BLABLA1 IN Child1 SET RELATION TO '' INTO Child1 IN Parent ADDITIVE