Before SRM 7.0 there were two Contract types:
PCTR - local conrtact in SRM for using in SRM as source of supply and
GCTR - global outline agreements which is distributed to ERP and used in ERP only as souce of supply.
As of SRM 7.0 CCTR - central contract was intoduced with a comination of GCTR and PCTR in terms of function and this can be used as source of supply in both SRM and ERP systems.
The main difference is that it uses new ESOA services for distribution and updation.
If the client doesnt have XI/PI then WSRM process can be used to transfer Contracts from SRM to eCC. Please find the beneth link below for more information.