SYMPTOM:
If you open Strategy Architect, you can rename logical tables to the name of another logical table. You are not able to do this in Strategy Developer.
In MicroStratey Developer:

Sample Code/Error
The specified table name is already in use. Please choose a new name.
In Strategy Architect:

CAUSE:
This is a known issue with Architect. This behavior should not be allowed. Avoid using the Strategy Architect to perform this action.
ACTION:
Contact Strategy Technical Support for an update on this issue.