Hi Lakshmi,
Execution variant functionality is there for Dunning as well as write-off's.
If you are planning to implement the functionality for dunning, you have to first configure an execution variant in the following SPRO node-
IMG-->Financial Accounting-->Contract Accounts Receivable and Payable-->Business Transactions-->Dunning-->Define Execution Variants for Dunning Proposal Run
The dunning proposal run evaluates the execution variants at event 300, if you have given the execution variant in the Dunning proposal run.
So in event 300, you need to plug in a FM which only gets triggered when a particular execution variant is given in the proposal run.
In the FM you can edit the proposal run, so that only those items are picked which belongs to a particular level.
Event 5015 is triggered for mass write-off if you are putting an execution variant in the mass write-off job.
Hope it clarifies.
Thanks,
Amlan