Upon checking out with a free product, we receive an error message: "Element BATCH_NUM unidentified in Variables."
ASI confirmed this when they tried to purchase a free product with no shipping charges, and told us this is a confirmed bug. We have not been able to get a resolution now since we upgraded on June 10th.
We have many free products in our online catalog and now that we have upgraded to 15.03 from 10.6 we can no longer offer them to our members.