Problem:
  The supplier number is missing or not written as agreed.

Solution:
  The supplier number is a mandatory information. Without this specification, your documents can not be processed.

    Please always use a unique anchor word, such as "Supplier number".
    Normally the unique indication (the anchor word) should have been agreed during the test phase. It should be noted that this is ALWAYS to be maintained.
   Thus, spelling mistakes within the anchor word lead to rejections.