TCA Merge Parties:

while merging the parties form TCA US we are getting the error like below

        Error: Merge failed in iSupplier Portal (POS_PARTY_SITES_V ) with the following error message:
        Error in iSupplier Portal Party Merge Routine: XXXXXXXXXXXXX is a supplier party created by Oracle
        Internet Supplier Portal. It can not be merged.
        The following record was being handled when the error occurred :



        From Record                                  Action                    To Record
        -----------------------------------------    ------------              ---------------
        [ -1 ]                                       Error                     N/A
pls provide the information on this .

Thanks in Advance.