User id in IT0105 ST0001 was changed for testing purpose. There were some workitems assigned to old user. On next day, I can see those workitems were assigned to new user id and added in table SWWUSERWI. How this happens, any job which does this.
User changes are not allowed during workflow execution as it creates inconsistency. Any change in the business document can restart the workflow and it could be a reason there was a new user or you may also need to check the substitute rules
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