Sub Agreement XML import error: XML import could not process field: CONTRACT_UNIQUE_DOC_NAME

Hi All,

I am importing Sub Agreement in XML format and getting below error.

XML import could not process field: CONTRACT_UNIQUE_DOC_NAME

unsupported null bind parameter no. 0

Below is the XML.

<?xml version="1.0" encoding="UTF-8"?>

<sapesourcing xsi:noNamespaceSchemaLocation="Contracts.xsd" defaultlanguage="" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <objects>

    <object classname="contracts.Agreement">

<fields> 

                                <CONTRACT_UNIQUE_DOC_NAME>P-XXXX-00001</CONTRACT_UNIQUE_DOC_NAME>

                                <DISPLAY_NAME>Testing Agreement Name 1 </DISPLAY_NAME>

                                <CALC_METHOD>UNIT_PRICE_ENTERED</CALC_METHOD>

                                <UNIQUE_DOC_NAME>S0002510</UNIQUE_DOC_NAME>

                                <STATUS>In Process</STATUS>

                                <COMPANY>TEST</COMPANY>

                                <LOCATION>Location_114</LOCATION>

                  </fields>

    </object>

  </objects>

</sapesourcing>

If anyone is successful in importing Sub Agreement in XML format?  also please validate the above xml structure?

Note: I am able to load  Sub Agreement using CSV. But in our scenario data comes in XML format.

Thanks & Regards

Sai