title: Posting SO to Acumatica: Branch Cannot Be Empty
body: <p>When I try to post a Sales Order to Acumatica using the SOAP API, I get the error </p>
  
  <pre><code>'Branch' cannot be empty.
  </code></pre>
  
  <p>I have examined the <code>SalesOrder</code> object and do not see any properties named Branch either in <code>SalesOrder</code> or in the <code>SalesOrderDetail</code>. I have considered that this might be referring to the login information, but the Branch there is set to "Default" and I have been successfully retrieving Item and Customer information with those credentials.</p>
  
  <p>Any insight on what I might need to do to resolve this?</p>