Hi Lakshmi,
You can use the execution variant functionality in the dunning parameters to trigger the proposal run for a particular dunning level for a given set of dunning procedure.
Using a run variant, you can postprocess the dunning proposal on the basis of any company-specific criteria.The run variant is transferred to event 300 (Postprocess Dunning Proposal) with structure PARA_0300.
You can also program run variants in events 301, 302, 303, 304, 306, 307, 309, and 311
In here, you can develop a FM to trigger only a particular dunning level based on the execution variant.
Hope it helps..
Thanks,
Amlan