title: Microsoft Dynamics eConnect-- allowed to have a negative markdown?
body: <p>We're using Dynamics GP 2010 and interfacing with it from C#.  We would like to have a negative markdown amount (MRKDNAMT in Dynamics parlance) but we're getting a strange error about the number of invoices being incorrect when we send over eConnect.  </p>
  
  <p>Would anyone know whether it's possible to have a negative MRKDNAMT?</p>