Illegal to have multiple roots (start tag in epilog?) in SAP CPI

Hi, all i need to update servicecall status from sap fsm on premise, for that i am fetching all fields from sapon premise system and splitting it and through get request and getting updated status but while gathering two payload i am getting two root it causes error to pass to post request request back to on pre mise system how two remove root and maintain single root <d> please help