How To Fix /IWBEP/CM_CP011 - Wrong method call: Navigation property '&2' has multiplicity '&1'

/IWBEP/CM_CP011 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_CP -

• Message number: 011

• Message text: Wrong method call: Navigation property '&2' has multiplicity '&1'

Self-Explanatory Message

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/IWBEP/CM_CP011 - Details

• The SAP error message /IWBEP/CM_CP011 indicates that there is an issue with the way a navigation property is being accessed in an OData service. This error typically arises when there is a mismatch between the expected multiplicity of a navigation property and how it is being called in the request.
  
  Cause:
  
  
  Multiplicity Mismatch: The error message specifies that the navigation property has a certain multiplicity (e.g., 0..1, 1, or *), and the method call is trying to access it in a way that is not compatible with that multiplicity. For example:
  
  If the navigation property is defined as a one-to-many relationship (multiplicity *), but the request is trying to access it as a single entity (multiplicity 1 or 0..1), this error will occur.
  Conversely, if the navigation property is defined as a one-to-one relationship but the request is trying to access it as a collection, this will also trigger the error.
  
  
  
  Incorrect URL or Query