Inventor iProperty Mapping Question

Would anyone know the Inventor (2010) iProperty name for "Eng. Approved Date:".  I've tried several variations I've found online, but can't seem to get it to work properly.  Maybe not supported, or maybe because its of type Date, not String.  Not sure.  All the other DTproperties I'm using seem to map fine.

Any thoughts would be appreciated...

Greg,

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