How To Fix MD_SUBSTN018 - Groups are not allowed

MD_SUBSTN018 - Overview

• Message type: E = Error

• Message class: MD_SUBSTN - Messages for Master Data Substitution

• Message number: 018

• Message text: Groups are not allowed

What causes this issue?

Application area does not support groups. For more information, refer to
Product Assistance for Product Substitution.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MD_SUBSTN018 - Groups are not allowed ?

  The SAP error message MD_SUBSTN018: Groups are not allowed typically occurs in the context of Material Requirements Planning (MRP) or when dealing with substitution or planning groups in SAP. This error indicates that the system is trying to process a group of materials or items in a way that is not permitted.
  
  Cause:
  
  Incorrect Configuration: The error may arise if the system is configured to expect individual materials but is instead receiving a group of materials.
  Substitution Settings: If you are trying to substitute a group of materials instead of individual items, the system may not allow this operation.
  Planning Group Usage: The error can also occur if a planning group is being used in a context where it is not allowed, such as in certain MRP runs or when creating procurement proposals.
  
  
  Solution:
  
  Check Material Group Settings: Review the configuration of the material groups and ensure that they are set up correctly. Make sure that