title: How to update an internal table with another internal table?
body: <p>I have this table and you'll notice that column <code>VKBUR</code> is empty:</p>
  <p><img src="https://i.stack.imgur.com/LyLzF.png" alt="Main table" /></p>
  <p>What is the best way to populate this column with entries from another table using column <code>VKGRP</code> as key?</p>
  <p>In summary, I would like to populate column <code>VKBUR</code> using data from <code>L_T_ZCUSTSL04</code> as source. Their key is <code>VKGRP</code> from both tables:</p>
  <p><img src="https://i.stack.imgur.com/0O8BK.png" alt="Look up table" /></p>
  <p>Using this lookup table, I want to pass values from <code>VKBUR</code> into the above table.</p>
  <p>Thank you so much for your assistance and have a good weekend.</p>