PostalAddressIndex not working as part of search filter in exchange 2013

[udayogra]

This is the request for creating a meeting:

<m:CreateItem MessageDisposition=""SaveOnly"" SendMeetingInvitations=""SendToNone""><m:SavedItemFolderId><t:DistinguishedFolderId Id=""contacts"" /></m:SavedItemFolderId><m:Items><t:Contact><t:Subject>asdf</t:Subject><t:FileAs>asdf</t:FileAs><t:GivenName>asdf</t:GivenName><t:PostalAddressIndex>Home</t:PostalAddressIndex></t:Contact></m:Items></m:CreateItem>

This is the request for search filter. It returns empty response when it should return one result.

<m:Restriction><t:IsEqualTo><t:FieldURI FieldURI=""contacts:PostalAddressIndex"" /><t:FieldURIOrConstant><t:Constant Value=""Home"" /></t:FieldURIOrConstant></t:IsEqualTo></m:Restriction>

Am I missing anything?