How To Fix AQ321 - This line must not be deleted

AQ321 - Overview

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 321

• Message text: This line must not be deleted

What causes this issue?

You attempted to delete a header line containing the title from a
statistic or ranked list, but you are not allowed to delete the title.

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?

Error message extract from SAP system. Copyright SAP SE.

AQ321 - Details

• The SAP error message AQ321 ("This line must not be deleted") typically occurs when you attempt to delete a line item in a document or transaction that is not allowed to be removed. This can happen in various contexts, such as during the processing of purchase orders, sales orders, or other documents where certain lines are mandatory or have dependencies.
  Causes:
  
  Mandatory Fields: The line item you are trying to delete may contain mandatory fields that are required for the document to be valid.
  Dependencies: The line item may be linked to other items or processes that prevent its deletion.
  Document Status: The document may be in a status that does not allow modifications, such as being locked for processing or already completed.
  Custom Logic: Custom validations or enhancements in the SAP system may enforce rules that prevent the deletion of certain line items.
  
  Solutions:
  
  Check Document Status: Ensure that the document is in a status that