How To Fix /IWFND/CM_GSR025 - Target cardinality is not modeled for relation '&1'.

/IWFND/CM_GSR025 - Overview

• Message type: E = Error

• Message class: /IWFND/CM_GSR -

• Message number: 025

• Message text: Target cardinality is not modeled for relation '&1'.

Self-Explanatory Message

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/IWFND/CM_GSR025 - Details

• The SAP error message /IWFND/CM_GSR025 Target cardinality is not modeled for relation '&1' typically occurs in the context of SAP Gateway and OData services. This error indicates that there is a problem with the cardinality definition of a relationship in your data model, specifically in the context of an OData service.
  
  Cause:
  
  Missing Cardinality Definition: The error suggests that the target cardinality for a specific relation (denoted by &1) has not been defined in the data model. Cardinality defines the number of instances of one entity that can be associated with instances of another entity.
  Modeling Issues: This can happen if the data model (e.g., in the Entity Relationship Model) does not properly define how entities relate to each other, particularly in terms of one-to-one, one-to-many, or many-to-many relationships.
  Service Metadata: If the OData service metadata does not reflect the correct relationships and cardinalities, it can lead to this error when trying to access