Workflow has not triggered for Purchase order in production.

Hi Experts,

For one of the user...the workflow(Object type - BUS2012 and event - RELEASESTEPCREATED) has not triggered for purchase order release.

In the workflow overview it is not showing any workflow for that purchase order..even in table..SWIWIOBJCT it is not showing any entry for that purchase order.

And for some users it is triggered for first time...and then for second time if some other user is doing any changes then it is not triggered.As per functional ppl  all the configurations are correct and also the PO is created properly.

I have a doubt like in SWETYPV...it is showing four custom workflows active for BUS2012 ...event RELEASESTEPCREATED and one for event SIGNIFICANTLYCHANGED.

1) Why there will be four active workflows for one object type and one event and How to find out actually which one is triggered.

2) User is saying earlier it was working fine..but it is not working now, what could be the reason?

3) Is there any mapping between User and Approver..we need to check..if yes then where we need to check this mapping.

Please suggest me if anybody is having any idea about this.

Thanks

Sonali