PO replicated in ECC doesn't contain contract number
I'm using the Extended Classic Scenario; in the PO automatically replicated in ECC there isn't the contract number.
In SRM and in ECC I have the same contracts with the same numbers. Then if the ECC PO doesn't contain the contract number, only the SRM contract is used and the release value of the ECC contract isn't updated.
What can I do to import the reference to the contract number in the PO replicated from SRM in ECC?
Thanks in advance.