demo for updating a transaction

hi all,

can anyone plz send me the demo for how to updata a transaction ,

not standard transaction like mm01,va01,me21 some what other transaction.why iam asking for some what other transaction when ever i was attending for interview they expecting some different transaction

plz help me ,so that i will be thankful to you.some differnt transaction with steps plzzzzzzzzzzz.

thank u all.