set Batch during production confirmation

Hello,

we have a discrete production. We work on a production order more than one shift. I like to stay at a single production order and to have a new batch each shift. The batch number should be based on a number range depending on plant data. The user which does the confirmation shouldn't be affected (e.g. have additional manual steps like using goods movement screen at confirmation).

I searched for a user exit where I can include my coding. Checked CONFPP05 as well as PPCO0001. In PPCO0001 there is POSITION_TABLE-CHARG but if I change the value there, it will be ignored by the system.

Any ideas?