[AndyD]

Попробуйте так

    qbDS2.relations(false);                
    qbDS2.addRange(fieldNum(InventDim, InventDimId)).
        value(strfmt("(((%2.dataAreaId == %3.DataAreaId) || (%2.dataAreaId != %3.DataAreaId)) && " +
                     "(%1.inventDimId == %3.inventDimId))",
                        qbDS1.name(), 
                        q.dataSourceTable(tableNum(InventTable)).name(), 
                        qbDS2.name()));