When I applied the unique key to the physical product, an error occurred when instantiating the engineering template. 
The error message is as follows: 
There was a problem when the system attempted to copy the template components on the server. Template instantiation has been aborted.
The reason is: An error occurred during the versioning or cloning process. The save operation failed. - (101,NonLinearVersioning.Error.CommitFailed).
Please contact your administrator.

Thanks in advance!