Document already exists

What causes this issue?

You want to create a document.
A document already exists with the data you entered for document
number, document type, document part and document version.

How to fix this error?

Check your entries.
If your entries are correct, display the document so that you can check
the data.
You may want to create a new version.
To do this, choose <ZH>Document -> New version</>.

Error message extract from SAP system. Copyright SAP SE.