Adding Vendor address on Vendor Update action through AIF

Hi,

I'm working on a requirement where I have to add/update addresses on Vendor update action through AIF file services. I know how to update an existing address. I'm finding it difficult to add an address on update action. 

Updating the existing address is simple. I just have to include the updatemode = "Correction" to the DirPartyPostalAddressView tag.

For adding an address if I specify updateMode="CreateNewTimePeriod", it gives an exception saying that "Entity update mode cannot be specified." and if I don't specify the updateMode, it gives an exception saying that "Entity update mode must be specified.". I don't know how to handle this.  Has anybody know how to resolve this problem?

Thanks in advance.

Madhu