Nested transaction is the natural property of session modification and many other things. In fact, not every one of such things using the concept of nested transaction to define the process of modifications. But many ones without using the concept of nested transaction at first have to use it at last for evolution problem. Jim Gray had a better discussion of it in his famous book "Transaction Processing: concepts and techiques".
Jim Gray(extract from his book):
There are many examples of systems that tried and failed to implement fault-tolerant or distributed computations using ad hoc techniques rather than a transaction concept. Subsquently, some of these systems were sucessfully implemented using transaction techniques. After the fact, the implementors confessed that they simply hit a complexity barrier and could not debug the ad hoc system without a simple unifying concept to deal with exceptions.
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