SAP Message WL407 - Workflow '&' no. &: Workflow container already exists in database

Diagnosis
When the workflow no. &V2& was started, it was found that the relatedworkflow container already exists in the database.

System Response
The workflow was not started.
INCLUDE NA_WF-ADMINISTRATOR OBJECT DOKU ID TX
A problem may have occurred when workflow instance numbers wereassigned resulting in a number being assigned twice by mistake.