What is the main use of SM13

Hello All,
What is the main use of SM13. I know the SAP definition tha tit is used to check"whether update is active".
So if the transactions are struck here,can we manually process them?
I see a couple of records with Status V2. When I try to manually update them, the system gives me a message"Update request does not have status init". What does this mean.
What would be the document change flow to delta queue. Is it as below?
In case of V3 updates,
1)The user make changes to a document.
The changes are made to application tables in V1 step-VBAK,VBAP etc
2)The delta(after and before image is captured in the log tables---How is this done?
3)The changes(before and after images) from the log table are moved to extarction queue in V2 step using function modules
4)In SM13, if you see the transactions in V2 status ,does it mean that the FM are not yet executed
5)once v2 is complete(FM' run) the delta is moved from log table to extraction queue, v3 init is run
6)all the accumulated changes are moved from extraction queue to delta
Thanks
Simmi

Hi,
Check if the following threads help :
sm13 and lbwq
Re: SM13 Best Practices?
Cheers,
Kedar

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