title: What's the fastest way to concatenate items from several lines into one field?
body: <p>In ABAP, what would be the fastest way to concatenate items of the same field from multiple lines into a field of one line?</p>
  
  <p>My program is supposed to report a list of payments, the vendor's ID, and the vendor's email addresses. </p>
  
  <p>Email addresses are stored in table ADR6, one line per address, along with the vendor's ID they belong to.</p>
  
  <p>For the report I would need an internal table populated with vendor IDs (unique key) and concatenated email_addresses, separated by semicolons.</p>
  
  <p>How to populate this internal table?</p>