Hi Deepak, FM updating from FI depends on the combination of the commitment items used in the posting, so if you have a commitment item 30/3 you need to combine it with another one depending on the results you are expecting, so for example:
With CI (30/3) combined with a CI (60/3) you get FM updated with value type 54 invoice, this is what is happening when you use transaction FB60 where an expense and vendor accounts are posted.
For additional details review the SAP Library proposed in the note and go to "Update Control: Financial Transaction and Value Type" session.
Update Control: Financial Transaction and Value Type - Funds Management - SAP Library
Regards
César