How To Fix SR440 - New serialization is not supported for RFC communication

SAP Error Message - Details

• Message type: E = Error

• Message class: SR - RFC utilities

• Message number: 440

• Message text: New serialization is not supported for RFC communication

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 SR440 - New serialization is not supported for RFC communication ?

  The SAP error message SR440, which states "New serialization is not supported for RFC communication," typically occurs in the context of Remote Function Call (RFC) communication between SAP systems. This error is related to the serialization of data being sent over RFC connections, particularly when there are compatibility issues between different versions of SAP systems or when certain configurations are not aligned.
  Causes:
  
  
  Version Mismatch: The error often arises when there is a mismatch between the versions of the SAP systems involved in the RFC communication. Newer versions may support features or serialization methods that older versions do not recognize.
  
  
  Configuration Issues: Incorrect configuration settings in the RFC destination or in the SAP system profiles can lead to serialization issues.
  
  
  Unsupported Data Types: If the data being sent includes types or structures that are not supported by the receiving system, it can trigger this error.
  
  
  Network Issues: Sometimes, network-related issues can cause serialization problems, especially if there are interruptions or delays in communication.
  
  
  Solutions:
  
  
  Check System Versions: Ensure that both the sending and receiving SAP systems are compatible. If one system is significantly older, consider upgrading it or adjusting the communication method.
  
  
  Review RFC Configuration: 
  
  Go to transaction SM59 to check the RFC destination settings.
  Ensure that the settings are correct and that the destination is properly configured for the type of communication being used.
  
  
  
  Adjust Serialization Settings: If possible, adjust the serialization settings in the SAP system profiles. This may involve changing parameters related to RFC communication.
  
  
  Data Type Compatibility: Review the data types and structures being sent in the RFC call. Ensure that they are compatible with the receiving system.
  
  
  Check for Notes and Patches: Look for SAP Notes or patches that address this specific error. SAP frequently releases updates that may resolve compatibility issues.
  
  
  Network Troubleshooting: If you suspect network issues, perform network diagnostics to ensure that there are no connectivity problems affecting the RFC communication.
  
  
  Related Information:
  
  SAP Notes: Search the SAP Support Portal for relevant SAP Notes that may provide additional insights or fixes related to this error.
  Documentation: Review the official SAP documentation regarding RFC communication and serialization to understand the requirements and limitations.
  Community Forums: Engage with SAP community forums or support channels where other users may have encountered and resolved similar issues.
  
  If the problem persists after trying the above solutions, it may be beneficial to contact SAP support for further assistance, providing them with detailed information about the systems involved and the context in which the error occurs.