The Idoc is available in CIG but is not getting into the Buyer portal,
I am getting the error like the Supplier: AN11171213425-T and the Buyer:0000001001 associated connection is not configured or saved. Please suggest steps to resolve this issue .
In the buyer Network , there is a activate relationships under Supplier enablement. I will be most glad, if you can please let me know the utility of this.
You want to be sure that you are going from Test>Test, because if this is sent from Test (Sandbox) to Production, and the Cloud Integration Gateway project is not yet deployed to Production, the PO's will fail.
One of the steps to move the project to production, is to create test scenarios when you create the project. You can add the required test scenarios and schedule to run.
If the projects are configured correctly, it's also possible that the issue is caused by an orphan connection under My Configurations > Connections.
Delete any connection that is not currently being used in the projects to avoid such inconsistencies.
After you check these two scenarios I hope that your issue is resolved.