Number range reqmt. different

What causes this issue?

You have entered items for several plants. In one of these plants,
specification of a goods receipt/issue slip number is mandatory, in
another plant it is not.

System Response

However, the system does not allow this situation. Either you specify a
GR/GI slip number for all items or for none of the items.

How to fix this error?

Cancel the item and re-enter it in a separate document.

Error message extract from SAP system. Copyright SAP SE.