Maintaining the Document Status 
Prerequisites
In Customizing Document management at least one status is defined for the document type of the document. If you want to control the order the status is set in you must create a status network. Settings in Customizing for the Document Management System, by choosing
Control data ® Define document types ® Define document statusProcedure
You see the screen Possible follow-up statuses for document type <Document type> with status <Status>.
The Document data tab page appears.
The system checks whether you are entitled to set this status for the chosen document type. If you are not entitled to do so, you see an error message.

The status you have just chosen may be defined as released. The Released indicator is displayed with the release date when you have saved.
Result
The newly set status is displayed in the
Status log. The complete status history can be displayed while processing.It is possible that other activities are triggered because of status changes.
See:
Overview of Additional Functions After Status Changes