How To Fix MW171 - You are not authorized for material class type &

SAP Error Message - Details

• Message type: E = Error

• Message class: MW - Messages IS-R / Allocation Tables

• Message number: 171

• Message text: You are not authorized for material class type &

System Response

The <DS:GLOS.class_type>material class type</> for for an allocation
rule is defined by the allocation rule type. If the allocation rule
type refers to a material class type for which you have no
authorization in the classification system, an error occurs and the
program is terminated.
&what_to_do&
Obtain authorization for the material class type in the classification
system.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MW171 - You are not authorized for material class type & ?

  The SAP error message MW171 ("You are not authorized for material class type &") typically occurs when a user attempts to perform an action related to a material class for which they do not have the necessary authorization. This can happen in various transactions involving material management, such as creating or modifying materials.
  Cause:
  
  Authorization Issues: The user does not have the required authorization to access or manipulate the specified material class type.
  Role Configuration: The user's role may not include the necessary permissions for the material class type in question.
  Material Class Type: The material class type being accessed may be restricted or not assigned to the user's profile.
  
  Solution:
  
  
  Check User Authorizations:
  
  Use transaction code SU53 immediately after encountering the error to see what authorization checks failed.
  Review the authorization objects related to material management, particularly those that pertain to material classes.
  
  
  
  Role Adjustment:
  
  If you have the necessary permissions, you can adjust the user's roles using transaction code PFCG.
  Ensure that the user has the appropriate roles assigned that include access to the required material class type.
  
  
  
  Consult with Security Team:
  
  If you do not have the necessary permissions to change roles, contact your SAP security or basis team. Provide them with the error details and request the necessary authorizations.
  
  
  
  Material Class Configuration:
  
  Check if the material class type is correctly configured in the system. This can be done using transaction code OMW1 (for material types) or OMW2 (for material classes).
  Ensure that the material class type is active and properly assigned to the relevant materials.
  
  
  
  Testing:
  
  After making changes to roles or authorizations, test the transaction again to ensure that the issue is resolved.
  
  
  
  Related Information:
  
  
  Authorization Objects: Common authorization objects related to material management include:
  
  M_MATE_MAR: Material master data authorization.
  M_MATE_WRK: Material master work center authorization.
  
  
  
  Transaction Codes:
  
  SU53: Display authorization check.
  PFCG: Role maintenance.
  OMW1: Maintain material types.
  OMW2: Maintain material classes.
  
  
  
  Documentation: Refer to SAP documentation or your organization's internal guidelines for managing user roles and authorizations.
  
  
  By following these steps, you should be able to identify the cause of the MW171 error and implement a solution to resolve it.