Ideally speaking when the proper configuarion of Batch Management is in place.
No need to create the batch Master manually by MSC1N.
The configuration of BM itself will take care of creation of a Batch master in the background during the Goods receipt process by the characteristics value inputtted in the MIGO screen for a Goods Receipt.
However if you want to intimate your vendor prior to the delivery about the batch you are requesting then in that case you need to create the batch master manually before processing the Purchase order. So that after processing the MSC1N you can maintain the created batch master in the purchase order.
Thanks and Regards,
Normally certain materials like chemicals need to be produced or procured in batches.For those materials you have to activate the batch management in the material master. check the purchasing or mrp view.there will be a check box.
for thosse materials system will create batches automatically while receiving or producing.
if the material is having the shelf life you need to give in the material master.
MSC1N facilitates to create the batch manually.you can create a batch at this transaction code and enter this batch at MIGO screen while receiving.
For more details check this link.