FUNCTION acyclic_contract_relationship
(relation : contract_relationship, relatives : SET [1:?] OF contract, specific_relation : STRING) : BOOLEAN;
LOCAL
x : SET OF contract_relationship;
END_LOCAL;
IF relation.relating_contract IN relatives THEN
RETURN (FALSE);
END_IF;
x := QUERY(cont <* bag_to_set(USEDIN(relation.relating_contract, 'CONTRACT_SCHEMA.' + 'CONTRACT_RELATIONSHIP.' + 'RELATED_CONTRACT')) | specific_relation IN TYPEOF(cont));
REPEAT i := 1 TO HIINDEX(x);
IF NOT acyclic_contract_relationship(x[i], relatives + relation.relating_contract, specific_relation) THEN
RETURN (FALSE);
END_IF;
END_REPEAT;
RETURN (TRUE); END_FUNCTION; -- acyclic_contract_relationship
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