How To Fix BTP_DL037 - RFC connection &1 from &2 to &3 is mandatory but &4 is optional

SAP Error Message - Details

• Message type: E = Error

• Message class: BTP_DL -

• Message number: 037

• Message text: RFC connection &1 from &2 to &3 is mandatory but &4 is optional

What causes this issue?

If an RFC connection is non-optional then also the source and the target
system type of the RFC connection must be mandatory.

How to fix this error?

Set the RFC connection as optional or remove the optional flag from the
participating system types.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BTP_DL037 - RFC connection &1 from &2 to &3 is mandatory but &4 is optional ?

  The SAP error message BTP_DL037 indicates an issue with the configuration of an RFC (Remote Function Call) connection in the context of SAP Business Technology Platform (BTP). The message states that a specific RFC connection is mandatory while another is optional, but the required connection is not properly configured or is missing.
  Cause:
  
  Missing Mandatory RFC Connection: The error typically arises when a required RFC connection (denoted as &1) is not set up or is incorrectly configured.
  Incorrect Configuration: The connection parameters for the mandatory RFC might be incorrect, leading to the system being unable to establish the connection.
  System Configuration Issues: There may be issues with the system landscape configuration, such as missing entries in the RFC destination table.
  
  Solution:
  
  
  Check RFC Connections:
  
  Go to transaction SM59 in the SAP GUI.
  Verify that the mandatory RFC connection (indicated as &1) is correctly defined and active.
  Ensure that the connection parameters (like target host, system number, client, user credentials, etc.) are correctly set.
  
  
  
  Create or Update RFC Connection:
  
  If the mandatory RFC connection does not exist, create it.
  If it exists but is not functioning, update the connection settings and test the connection.
  
  
  
  Check Authorization:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations to access the target system.
  
  
  
  Review Logs:
  
  Check the system logs (transaction SM21) and the application logs (transaction SLG1) for any additional error messages that might provide more context.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific error message for any additional troubleshooting steps or known issues.
  
  
  
  Related Information:
  
  RFC Destinations: RFC destinations are defined in transaction SM59 and are crucial for enabling communication between different SAP systems or between SAP and non-SAP systems.
  SAP Notes: Check SAP Notes for any updates or patches that might address known issues related to RFC connections.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the BTP_DL037 error and ensure that the necessary RFC connections are properly configured.