Problem while Posting a Transaction

Hi,

I am trying to send a whole Object property in a Edit transaction (Just like standard WorkOrder Post).

But in  my Object I have two custom Object properties (one is a External Data property and the other is a Embedded Image property).

While Posting this transaction I am getting a strange error. (I have attached the screen shot of the error).

It seems like while posting a whole Object in a transaction, if that Object's direct Properties or child properties contains any embedded Image/ External Data(which are left empty), then the frame work throws an error like the one that is attached.

But this seems not right.

Is there anything I can do to fix this?

Regards

Madan KM