Source system does not exist

What causes this issue?

You have specified that you want to restore source system &V1&.This
source system is not known in BW.

System Response

The source system was not restored.

How to fix this error?

Recreate the source system.
If the source system should be known to BW, the name of source system
<(>&<)>V1<(>&<)> is perhaps incorrect. Rename the source system and try
the function again.

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.