How To Fix RAP_CMP_CHECKS074 - Return type nullable of operation &1 from service &2 changed.

SAP Error Message - Details

• Message type: E = Error

• Message class: RAP_CMP_CHECKS - RAP Compatibility Checks Messages

• Message number: 074

• Message text: Return type nullable of operation &1 from service &2 changed.

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 RAP_CMP_CHECKS074 - Return type nullable of operation &1 from service &2 changed. ?

  The SAP error message RAP_CMP_CHECKS074 indicates that there is a mismatch in the return type of an operation in a service definition within the RAP (Rapid Application Programming) model. Specifically, it suggests that the return type of an operation has been changed to nullable, which can lead to inconsistencies in the service's expected behavior.
  Cause:
  
  Change in Return Type: The return type of an operation in a service has been modified to allow for null values. This could happen due to changes in the underlying data model or service definition.
  Inconsistent Service Definition: The service definition may not align with the expectations of the consumers of the service, leading to potential runtime errors or unexpected behavior.
  Model Changes: Changes in the data model or business logic that affect how data is returned from the service.
  
  Solution:
  
  Review Service Definition: Check the service definition for the operation mentioned in the error message. Ensure that the return type is correctly defined and matches the expected behavior.
  Update Consumers: If the return type has been intentionally changed to nullable, ensure that all consumers of the service are updated to handle the possibility of null values appropriately.
  Re-generate Service: If changes were made to the underlying data model or service definition, consider re-generating the service to ensure that all components are in sync.
  Check for Dependencies: Look for any dependencies or related services that might be affected by this change and update them accordingly.
  Testing: After making the necessary changes, thoroughly test the service to ensure that it behaves as expected and that consumers can handle the nullable return type.
  
  Related Information:
  
  RAP Model: The RAP model is designed to simplify the development of business applications in SAP, focusing on the use of CDS (Core Data Services) views and OData services.
  Service Consumption: When services are consumed, especially in Fiori applications or other UI technologies, it is crucial to handle nullable return types to avoid runtime errors.
  Documentation: Refer to SAP documentation on RAP and OData services for best practices on defining service operations and handling return types.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting the SAP community for further assistance.