Backend Contract is not updated in the history in SAP SRM

Hi,

We are working in Classic scenario SRM7.02.

Process Flow:

RFx Created -> Rfx Response Created -> Back end Contract is created in ECC -> Confirmation XML for Contract is not triggered from ECC to SRM.

In my case, the  confirmation XML for contract is not triggered from ECC to SAP SRM. Kindly let me the settings need to be done.

Thanks in advance.