An AC codeshare on LH, booked in L on AC, will show up as a W fare on LH when it posts. However, often AC's system will reject the W fare as this is its own award class. If this happens, send in a copy of the ticket indicating the original AC codeshare flight number and booking class, along with the LH boarding pass stub. (Always save these items as your miles should post within a day or two of the flight, at the latest. If it doesn't best to send this into the AE centre for credit.)