The kanban container has already been entered (see item &1)

What causes this issue?

You enter several kanban containers, to post them together afterwards.
You can only enter each kanban container once. This kanban container has
already been entered.

System Response

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

How to fix this error?

Check your entry

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.