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SYNTAX:
 
 xpxGetInverseAttrAggr(instanceId, attrId : GENERIC;                      VAR aggrId         : AGGREGATE OF GENERIC)                       status             : INTEGER;
 
All Inverse attributes are implemented as aggregates in order to keep multiple inverse relations. The xpxGetInverseAttrAggr function is implemented in order to retrieve the actual aggrID of an Inverse attribute that is declared (in the Express schema) as a simple data type (not an aggregate).

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