How To Fix 5B154 - Relationship &1 is not allowed between object types &2 and &3 ->F1

SAP Error Message - Details

• Message type: E = Error

• Message class: 5B -

• Message number: 154

• Message text: Relationship &1 is not allowed between object types &2 and &3 ->F1

What causes this issue?

You have selected a relationship between the two object types
which is not allowed according to table 777E.
Please check that you have entered the correct object types
and relationship name.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 5B154 - Relationship &1 is not allowed between object types &2 and &3 ->F1 ?

  The SAP error message 5B154 indicates that there is an invalid relationship being defined between two object types in the system. This error typically arises in the context of SAP's data modeling or object management, where certain relationships are restricted based on the types of objects involved.
  Cause:
  The error message "Relationship &1 is not allowed between object types &2 and &3" suggests that:
  
  You are trying to create or maintain a relationship (denoted as &1) between two object types (denoted as &2 and &3) that are not compatible.
  The specific relationship you are attempting to establish is not permitted by the system's configuration or business rules.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Object Types: Verify the object types involved in the relationship. Ensure that you are using the correct object types as per the business requirements.
  
  
  Review Relationship Definitions: Look into the configuration of relationships in the relevant SAP module (e.g., SAP CRM, SAP PLM). Check if the relationship you are trying to create is defined in the system and if it is allowed between the specified object types.
  
  
  Consult Documentation: Refer to the SAP documentation or help files related to the specific module you are working with. This can provide insights into valid relationships between object types.
  
  
  Use Transaction Codes: If applicable, use transaction codes like SWO1 (Business Object Builder) or SWDD (Workflow Builder) to review and modify object types and their relationships.
  
  
  Seek Help from SAP Support: If you are unable to resolve the issue, consider reaching out to SAP support or your internal SAP team for assistance. They may have additional insights or access to configuration settings that can help.
  
  
  Related Information:
  
  Object Types: In SAP, object types can refer to various entities such as business partners, materials, documents, etc. Each object type has specific relationships that are allowed.
  Relationship Types: Relationships can be hierarchical (parent-child) or associative (many-to-many). Understanding the nature of the relationship you are trying to create is crucial.
  Customization: In some cases, the relationships can be customized through configuration settings in the SAP system. This may require appropriate authorizations and knowledge of the system's customization options.
  
  By following these steps and understanding the context of the error, you should be able to identify the root cause and implement a solution.