How To Fix VT621 - The assignment and reference number fields must be ' ' or E

VT621 - Overview

• Message type: E = Error

• Message class: VT - Vertriebstabellen

• Message number: 621

• Message text: The assignment and reference number fields must be ' ' or E

What causes this issue?

In the controls for copying billing document (F2) from credit memo (CR)
or debit memo (DR) the assignment number and reference number fields
should be ' ' or contain 'E'.
This message appears if VBTYP for the source document is 'M' and VBTYP
for the target billing document is '0' or 'P'. This copy control means
that the billing document is created directly from a credit memo or a
debit memo.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Leave the assignment number and reference number field blank or enter
'E'.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message VT621 - The assignment and reference number fields must be ' ' or E ?

  The SAP error message VT621 indicates that there is an issue with the assignment and reference number fields in a transaction related to transport management or logistics. This error typically arises when the system expects these fields to be either empty (' ') or contain the value 'E' (which usually stands for "external" or "error"). 
  
  Cause:
  
  Incorrect Data Entry: The fields for assignment and reference numbers may have been filled with invalid data that does not meet the expected criteria.
  
  Configuration Issues: There may be a configuration issue in the transport management system or the specific module you are working with.
  Custom Development: If there are custom developments or enhancements in your SAP system, they might be causing the fields to be populated incorrectly.
  
  
  Solution:
  
  Check Field Values: Review the values entered in the assignment and reference number fields. Ensure they are either left blank or set to 'E'.
  Review Configuration: If you have access, check