How To Fix WTY078 - Relationship type &1 is not allowed between items

SAP Error Message - Details

• Message type: E = Error

• Message class: WTY - Warranty processing

• Message number: 078

• Message text: Relationship type &1 is not allowed between items

Self-Explanatory Message

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• What is the cause and solution for SAP error message WTY078 - Relationship type &1 is not allowed between items ?

  SAP Error Message:
  
  WTY078 - Relationship type &1 is not allowed between items
  
  Cause:
  This error occurs when you try to assign a relationship type between two items in a Bill of Materials (BOM) or a similar structure, but the relationship type you are attempting to use is not permitted between those particular item categories or item types.
  In SAP, relationship types define how components relate to each other in a BOM (e.g., "Is a component of," "Is a substitute for," etc.). Each relationship type is allowed only between certain item categories or item types. If you try to assign a relationship type that is not configured or allowed for the involved item categories, SAP throws this error.
  
  Typical Scenarios:
  
  Assigning a relationship type between incompatible item categories (e.g., trying to link a document item to a material item with a relationship type that is only valid between material items).
  Using a custom or standard relationship type that is not maintained in the configuration for the item categories involved.
  Attempting to create a relationship in a BOM or equipment structure where the relationship type is restricted.
  
  
  Solution:
  
  
  Check the Relationship Type Configuration:
  
  Go to the customizing path:
  Logistics - General > Bill of Materials > Bill of Material > Define Relationship Types
  
  Verify the relationship type you are trying to use.
  Check which item categories or item types are allowed for this relationship type.
  
  
  
  Check Item Categories:
  
  Identify the item categories of the two items you are trying to link.
  Ensure that the relationship type is allowed between these item categories.
  
  
  
  Adjust Relationship Type or Item Categories:
  
  If the relationship type is not allowed, either:
  
  Use a different relationship type that is allowed between these item categories.
  Change the item categories if appropriate and possible.
  Or extend/customize the allowed relationship types for the item categories if business requirements demand it (requires configuration changes).
  
  
  
  
  
  Consult SAP Documentation or Support:
  
  Review SAP notes or documentation related to BOM relationship types.
  If this is a custom relationship type, verify that it has been properly configured.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  CS01 / CS02 / CS03 - Create / Change / Display BOM
  IE01 / IE02 / IE03 - Create / Change / Display Equipment (if applicable)
  SPRO - Customizing for relationship types
  
  
  
  SAP Notes:
  
  Search for notes related to WTY078 for any known issues or patches.
  
  
  
  Configuration Tables:
  
  Table T370A - Relationship types and allowed item categories.
  Table STPO - BOM item data.
  
  
  
  
  Summary:
  The error WTY078 indicates a mismatch between the relationship type and the item categories involved. The solution is to verify and correct the relationship type configuration or the item categories to ensure compatibility.
  
  If you provide the specific relationship type and item categories involved, I can help you identify the exact allowed combinations or suggest alternatives.