Project &1 has not yet been migrated. Migrate it first

What causes this issue?

You are trying to edit a project which does not yet use the central
logical components. You cannot do so.

System Response

Action cancelled.

How to fix this error?

Run the program SOLMAN_LOG_COMP_MIGR to convert the project to the
central logical components.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.