How To Fix /PLMI/PPE_BO022 - Relationship between &1&3 and child &2&4 not allowed; invalid child class

/PLMI/PPE_BO022 - Overview

• Message type: E = Error

• Message class: /PLMI/PPE_BO -

• Message number: 022

• Message text: Relationship between &1&3 and child &2&4 not allowed; invalid child class

Self-Explanatory Message

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/PLMI/PPE_BO022 - Details

• The SAP error message /PLMI/PPE_BO022 indicates that there is an issue with the relationship between a parent object and a child object in the context of SAP's Product Lifecycle Management (PLM) or similar modules. Specifically, the error states that the relationship between the specified parent (&1&3) and child (&2&4) is not allowed due to an invalid child class.
  
  Cause:
  
  
  Invalid Relationship Definition: The relationship you are trying to establish between the parent and child objects is not defined in the system. This could be due to a configuration issue where the relationship type does not support the specific combination of parent and child classes.
  
  
  Incorrect Object Types: The parent and child objects may not be of compatible types. For example, if the parent is a material and the child is a document, the system may not allow this relationship.
  
  
  Customizations or Enhancements: If there have been customizations or enhancements made to the object types