It is illegal to buy beer and wine in the exact same transaction.

The Law Explained

Due to the state's famously complex and archaic liquor laws, grocery stores that sell both beer and wine must process the transactions separately. Originally, the Pennsylvania Liquor Control Board tightly separated the sale of spirits, wine, and malt beverages to control consumption after Prohibition. While laws have relaxed to allow sales in grocery stores, you still have to ring up your six-pack and your Chardonnay on different receipts.