Manufacturing Orders and Lots

Hi, I am trying out Dolibarr to see if it makes sense for our operation and to see if it can handle some of the functionality we need. I am trying to create a Manufacturing Order to move stock of one item to another while making a size run. I keep getting an error message that reads:
Field ‘Lot/Serial’ is required for product …
But I can’t find where I would designate the lot in the Bill of Goods or the MO. The lot is attached to both the item being consumed and the item being created. Can someone point me in the right direct for how to include lots when manufacturing products?