title: SAP B1: Sales and Returns in one query
body: <p>I'm a new in SAP B1.
  Have a task to show the Sales and Returns for the period by BP in one query and after to create the Crystal Report based on data.
  ORDR and RDR1 - Sales
  ORDN and RDN1 - Returns.
  Can you please advise how can I join them?
  Thanks in advance.</p>