A good starting point would be help.sap.com
Use Google, enter this Batch determination site:help.sap.com and you directly get the pages from help.sap.com
Alternative enter "Batch determination" right here on top right to get 3600 results from SCN.
on the right of the hits you can filter e.g. by wiki or by blogs, or documents.
Those 3 would be my personal starting point before digging into discussions.
There is a lot material with pictures and steps.