create credit from a complaint

Hi all,

We want to capture customer complaint where following activity should be mapped.

1. Entry of Customer complaint with nature- using Qm01

2. Action to be taken at client side against complaint enetered (status changed of complaint i.e. person will visit to

customer  within xx date & xx time)

3. Auto creation of Credit memo with reference to complaint no once complaint is going to closed.

Basically i understand the step 1 and 2 and my question is how can i create step 3. SI ther any function module i could use. Thanks

cheers

Jasmeet