Currently, when importing relationships to existing constituents in RE NXT, the only option for matching to existing constituents is to map to either 'Constituent Lookup ID' or System Record ID. We really need to be able to map to Constituent Import ID. Especially when using a hybrid approach using both IOM-Classic and IOM+/OC, IOM-Classic furnishes the Import ID as an output field, but not the 'lookup ID' nor the System Record ID. This would be a very useful and valuable feature, and would allow clients to leverage the benefits of both versions of IOM.