How and where does SAP standard programs update the master tables...

Hello there,

How and where does SAP standard programs update the master tables...

to be precise.. if a (any) transaction occurs the programs behind it holds the data in temporary structures.

where and when does it get updated in the master table.

can anyone tell me how it happens?

I Know that from the where used list one can find the corresponding table but most of the time it wont suffice

I am expecting a proper answer.

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Santosh B