Component Backflush (MFBF) - Process component list - User exit?

Question

We do the goods issue of the component (Mvt: 261) using the option below;
"Component Backflush (MFBF) - Process component list". The users add the component directly in the screen entry "Process component list". But when they save, the requirement is to "add an additional packaging material internally say in a userexit or BADI".  Is it possible to add another component automatically using userexit?
I tried the enhancements: XMRM0001 and also BADI for GOODSMVMT but no help. Any ideas? Appreciate your help. And expect a REWARD !!!! :):)
Srini

Answer 1

When I hit 'SAVE' on "Process Component list" screen, it stops at EXIT_SAPLMBARM_002. But by that time the material document is already created
The process steps that I follow are as below:
1) MFBF
2) Choose radio button 'Component Backflush'
3) Click on 'Process component list'
4) Enter the Material 'M1', Plant and batch, Qty, Mvt: 261 and Hit enter
5) ...... NOW ..
6) BEGIN .. THE CUSTOM REQUIREMENT
  "When there is M1 in the list, Add automatically 'P1' material with 531  Plus 
  "When there is M1 in the list, Add automatically 'P1' material with 261  Minus
7) END    .. THE CUSTOM REQUIREMENT
8) So the resulting Material document (Goods Issue) will have 3 line items:
a) M1 261
b) P1 531
c) P1 261
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