& is already processing commitment item &

What causes this issue?

You want to create a new commitment item with key &V2&. For technical
reasons, it is not possible to create several commitment items with the
same key if the key has more than 13 characters. This also applies if
they are assigned to different FM areas or hierarchy versions.
User &V1& is currently creating a commitment item with the same key.

System Response

The commitment item is not created.

How to fix this error?

Create the commitment item later.

Error message extract from SAP system. Copyright SAP SE.