Only one entry allowed for supply area, resp. person, or stge location

What causes this issue?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

You can select Kanban data according to the three options listed
below:
For a supply area:
Here, enter only the supply area.
For a supply area of a specific responsible person:
Here, only enter the responsible period.
For all supply areas that are assigned to a certain storage location:
Here, only enter the storage location.

Error message extract from SAP system. Copyright SAP SE.