Diagnosis
You entered a transport layer that does not start 'Y' or 'Z'.
In a customer namespace you can only create transport layers that startwith 'Y' and 'Z'. The only other transport layer you can use is 'SAP',for defining the tranport routes for repairs to SAP objects.
Problems with transport layer namespaces occur only when SAP andcustomer systems both exist in a transport domain, and you want totransport changed objects from these systems automatically in transportrequests.

System Response
Your entry is rejected, or an error appears in the check log.

Procedure
Enter a (custoner) namespace that starts with 'Y' or 'Z', or the layer'SAP'. If the error appeared in the check log, check the following:
All systems with the standard transport layer <(>&<)>V1<(>&<)> must becustomer systems.
All source systems of transport routes with the transport layer<(>&<)>V1<(>&<)> must also be customer systems.
If these conditions are met you can ignore the error.