VNXE3200 Deleting Replication Error

Dears,

i am having a problem with VNXe3200, the issue is that i am trying to stop a manual replication between 2 VNXe3200 devices, when i select replication and try to kill the process i am receiving the below error:

The changes could not be applied, the following error was encountered:

Delete the replication session:

Execution Errors:

Another replication operation is already in progress. Please try again later.

(Error Code:0x987f)

any advice how to solve this issue, i need to stop the manual replication and enable the automatic replication.