What are the essential cases where we must have use update module F.M.

Dear sap Friends ,
I want to update or insert bill no. in a ztable when creating bill through VF01 .
I have done it through insert sql query as well as by update module enabled functin module .
what are the essential cases where we must have to use update module enabled functin module and why we use IN UPDATE TASK .
mainly i want to know in which case i must have to use update module enabled functin module and not by insert or modify query used smply .
Thanks ,
Amit Ranjan .

Hi Amit,
I sincerly advice you to search SCN or any anywherelse as big theory is behind this
few related info.
If you are using more than one screen to collect the data to update a perticular table and corresponding underlying table Child table in that case , after every screen change an implicit data base commit takes place and you are still collecting the data from other screens , in such cases you use IN UPDATE TASK
Please go through SAP LUW
Regards
Ramchander Rao.K

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