MDM Webservice not able to populate lookup values during creation

Hi All,

I am currently working on MDM web services for creating and updating data in MDM. I have a problem that i am not able to pass lookup values while creating new record.

The lookup field has two parameters,

1. displayValue

2. recordIdentification (internalID)

It seems both values needs to be passed. If i did not pass any value the lookup field is blank in the table.

Can anyone give me a solution, how to pass the value for lookup field through MDM web service?

How to get InternalID for that field?

Image may be NSFW.
Clik here to view.

Thanks in Advance!!!