title: How the EXPORTING method parameters passed by value?
body: <p>I'm wondering about the definition of a call-by-value EXPORTING argument of an ABAP method call.</p>
  
  <p>The SAP Help Portal states that EXPORTING parameters can be defined call-by-value (and call by reference).  It does not give a precise definition of how this parameter type is handled. Instead, it states </p>
  
  <blockquote>
    <p>For precise details of the relevant ABAP statements, refer to the
    corresponding keyword documentation in the ABAP Editor.</p>
  </blockquote>
  
  <p>Now, the ABAP Keyword Documentation of the SAP editor does not mention pass-by-value for EXPORTING.  (It does mention pass-by-value for IMPORTING and CHANGING).</p>
  
  <p>I can guess the meaning of pass-by-value EXPORTING.  But I want to read the definition.  From FORM/PERFORM, I know that details can be subtle.  Could you point me to an official description of this case?</p>