Batch Classification Update duing MIGO

Hello Experts,

I have a requirement where in i have to update one of the batch characteristics with my own value when the user presses the classification button in MIGO transaction during GR.

I tried various user exits and BADI's to accomplish this but ultimately was unsuccessful.

The most useful BADI which i felt would solve my purpose was CACL_VALUE_CHANGE.

Here only some characteristics are flowing and not all.

I even tried to debug the standard program but again could not get any clue.

Very thankful to anyone who could help me.

Cheers,

Ravi Kiran