Several check steps still exist!

What causes this issue?

The product allocation method has been set to the discrete check.
Several product allocation steps exist in the hierarchy settings for
product allocation procedure &v1&. For the discrete check only one
product allocation step with an empty step counter is allowed.

System Response

The product allocation will not work.

How to fix this error?

Adjust the hierarchy setting for the product allocation check
accordingly.

Error message extract from SAP system. Copyright SAP SE.