HARRISBURG, Pa. – Wal-Mart is canceling an agreement to install 23 state-controlled wine-vending machines in some Pennsylvania stores. A company statement Wednesday cites mechanical concerns. However, a lawyer for the contractor, Simple Brands, says mechanical problems affect less than one-half percent of transactions. Pennsylvania Liquor Control Board CEO Joe Conti says it's disappointing, but he says the board and Wal-Mart are discussing other partnerships, such as a store-within-a-store concept.