How To Fix CL_SADL_GW_MDE_MSGX021 - & is not array annotation

SAP Error Message - Details

• Message type: E = Error

• Message class: CL_SADL_GW_MDE_MSGX - texts for parser

• Message number: 021

• Message text: & is not array annotation

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CL_SADL_GW_MDE_MSGX021 - & is not array annotation ?

  The SAP error message CL_SADL_GW_MDE_MSGX021 typically indicates an issue related to the use of annotations in the context of the SAP Gateway and the SAP ABAP programming model. This error often arises when the system expects an array (or collection) but receives a single value or an incorrect data structure instead.
  Cause:
  
  Incorrect Data Structure: The error usually occurs when the data being processed does not conform to the expected structure. For example, if the system expects an array of values but receives a single value or a different type of data structure.
  Annotation Misconfiguration: The annotations in the OData service might not be correctly defined, leading to a mismatch between the expected and actual data types.
  Model Definition Issues: There could be issues in the definition of the data model, such as incorrect entity types or relationships that do not align with the expected input/output.
  
  Solution:
  
  Check Data Structure: Ensure that the data being sent to the OData service is in the correct format. If an array is expected, make sure to wrap the data in an array structure.
  Review Annotations: Go through the annotations defined in your CDS views or OData service definitions. Make sure that they are correctly set up to reflect the expected data types.
  Debugging: Use debugging tools to trace the data flow and identify where the mismatch occurs. This can help pinpoint whether the issue is with the data being sent or with the service definition.
  Update Model Definitions: If there are issues with the model definitions, consider updating them to ensure they align with the expected data structures.
  Consult Documentation: Refer to SAP documentation for the specific version you are using to understand the expected data structures and annotations.
  
  Related Information:
  
  SAP Gateway: The SAP Gateway is a technology that enables the connection of devices, environments, and platforms to SAP systems. Understanding how it handles data and annotations is crucial.
  OData Services: Familiarize yourself with OData service definitions and how they interact with the underlying data models in SAP.
  CDS Views: Core Data Services (CDS) views are used to define data models in SAP. Ensure that your CDS views are correctly defined and annotated.
  
  If the problem persists after checking these areas, consider reaching out to SAP support or consulting the SAP Community for more specific guidance related to your implementation.