How To Fix WW019 - MG reference material & already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: WW - Material group master maintenance

• Message number: 019

• Message text: MG reference material & already exists

What causes this issue?

The reference material is already being used for other base material
groups.

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?

If you confirm this message by pressing Enter, the reference material
will also be used for this base material group. If you do not wish this
to happen, cancel processing and enter a new material number.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WW019 - MG reference material & already exists ?

  The SAP error message WW019, which states "MG reference material & already exists," typically occurs when you are trying to create a new material in the system, but a material with the same reference already exists. This can happen in various scenarios, such as when creating a material using a reference material or when trying to copy an existing material.
  Cause:
  
  Duplicate Reference: The material you are trying to create or copy already exists in the system with the same reference number or key.
  Incorrect Data Entry: There may be a mistake in the data entry where the reference material number is incorrectly specified.
  Material Type Restrictions: Certain material types may have restrictions on how they can be created or copied, leading to conflicts.
  
  Solution:
  
  
  Check Existing Materials: Before creating a new material, check the existing materials in the system to see if the reference material already exists. You can do this by using transaction codes like MM03 (Display Material) or MM02 (Change Material).
  
  
  Use a Different Reference: If the reference material already exists, consider using a different reference material or creating a new material without using a reference.
  
  
  Review Material Type: Ensure that the material type you are trying to create allows for the creation of new materials based on a reference. Some material types may have specific rules.
  
  
  Consult Documentation: Review SAP documentation or your organization's guidelines for creating materials to ensure compliance with any specific procedures.
  
  
  Error Handling: If you believe this error is incorrect (e.g., the material should not exist), consult with your SAP administrator or support team to investigate further.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as MM01 (Create Material), MM02 (Change Material), and MM03 (Display Material).
  Material Master Data: Understanding the structure and management of material master data in SAP can help prevent such errors.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Authorization: Ensure that you have the necessary authorizations to create or modify materials in the system.
  
  If the issue persists after following these steps, it may be beneficial to reach out to your SAP support team for further assistance.