EWM Location exits or not

Dear Experts,

i have a huge Problem in my test System and i have no idea what is the reason for the Problem.
I want to create a supply chain unit for my plant 1961 as the start Location for the routes.

I push the button "create".

The System gaves me this message. I had create before a "SP1961" as shipping Point. I delete them before i try to create the entry above.

But if i try to Display the 1961 which Exits as the message shown.

But the Systems gaves the message the Location 1961 doesnt Exits... :-(

And at These Point i gave up.

And a additional question which start Location i Need for the routes?

In the outbound order there are the following Information about the Location

I hope somebody can give me help.

Regards

Kai