Problem:
  One or more EANs/GTINS are missing.

Solution:
   EANs/GTINS are mandatory information. Without this information, your documents cannot be processed.
   Please always use a unique anchor word.
   Normally, the unique statement (the anchor word) should have been agreed during the test phase.
   Please note that this anchor word, is ALWAYS to be maintained. That is the reason why typing errors within the anchor word also lead to rejections.