Configuration &1 is in customer namespace! Still process?

What causes this issue?

The name '&V1&' is reserved for customers for action box
configurations. The configuration '&V1&' should therefore not be
processed in one of the SAP AG systems.

System Response

If you choose <LS>Continue</>, the function is executed.
If you choose <LS>Cancel</>, the function is canceled.

How to fix this error?

Cancel the function and choose a configuration to process that is in
the SAP name range.

Error message extract from SAP system. Copyright SAP SE.