How To Fix /IWBEP/CM_V4_MED348 - Navigation properties not allowed for complex property collection '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 348

• Message text: Navigation properties not allowed for complex property collection '&1'

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED348 - Navigation properties not allowed for complex property collection '&1' ?

  The SAP error message /IWBEP/CM_V4_MED348 indicates that there is an issue with the use of navigation properties in a complex property collection within an OData service. This error typically arises when you attempt to navigate through a collection of complex types, which is not allowed in the OData protocol.
  Cause:
  
  Complex Property Collection: The error occurs when you try to access a navigation property on a collection of complex types. In OData, navigation properties are meant to link to entities, not to collections of complex types.
  Incorrect Model Definition: The OData service model may be incorrectly defined, where a complex type is being treated as an entity type, or navigation properties are incorrectly defined.
  
  Solution:
  
  Review the OData Model: Check the definition of your OData model. Ensure that you are not trying to navigate through a collection of complex types. If you need to access related data, consider changing the model to use entity types instead of complex types.
  Modify the Query: If you are making a request that includes navigation properties, ensure that you are only using them with entity types. If you are querying a collection of complex types, remove any navigation properties from your query.
  Use Entity Types: If you need to have relationships, consider defining the related data as entity types instead of complex types. This allows you to use navigation properties correctly.
  Check Service Implementation: If you are developing the OData service, ensure that the service implementation adheres to the OData standards regarding complex types and navigation properties.
  
  Related Information:
  
  OData Protocol: Familiarize yourself with the OData protocol specifications, particularly regarding entity types and complex types. Understanding the differences will help in designing your data model correctly.
  SAP Gateway Documentation: Review the SAP Gateway documentation for guidelines on defining OData services, especially concerning complex types and navigation properties.
  Debugging Tools: Use debugging tools available in SAP Gateway to trace the request and response, which can help identify where the navigation property is being incorrectly used.
  
  By addressing the model definition and ensuring that navigation properties are only used with entity types, you should be able to resolve the error message /IWBEP/CM_V4_MED348.