How to update existing contract in the Core contract Repository using API

Hi,

We have a requirement to create/update contract headers from an external feed using API. For the creation part we are using the private API OKC_REP_UTIL_PVT.validate_and_insert_contracts which is used by the import program as suggested by Oracle. It is working correctly, the contract is getting created and can be seen in the base table OKC_REP_CONTRACTS_ALL and front end. But we are not getting any procedure to make amendments to the existing contracts. We need some API/procedure which will let us update the contract headers information and create a new version of the existing contract as it allows from the front end.