title: What does the percent sign indicate in abap function parameter?
body: <p>I have encounters this abap snippet that I have difficulty to comprehend.</p>
  
  <pre><code>call function 'com_invoke'
     destination pv_wrkdest
     exporting
          %instid         = pv_instance
          %method         = 'FieldCountGet'
     importing
          %return         = lc_return
          fieldcount      = pv_fieldcount
     exceptions
          communication_failure = 1
          system_failure        = 2
          invalid_instance_id   = 3
          others                = 4.
  </code></pre>
  
  <p>What does the percent sign indicates in the %instid, %method and %return parameters?</p>