How To Fix XS821 - Cannot process message in node, parameters cannot be converted

XS821 - Overview

• Message type: E = Error

• Message class: XS - SAPconnect: All messages

• Message number: 821

• Message text: Cannot process message in node, parameters cannot be converted

What causes this issue?

The message cannot be processed in the node as parameters such as 'Send
time' or 'Priority' cannot be converted. It is possible that entire
parameters such as 'Recipient list' or 'Packet list' are missing.

System Response

Processing was terminated.
SAP system additional information (error number, if available):
&V2&
Additional information of the node used (in the system language of the
node):
&V4&

How to fix this error?

Notify your system administrator. If a trace exists for the node, use it
to find out which parameters are missing. Modify the message accordingly
(for example, by changing the send class). You may need to notify the
manufacturer of node &V1& or the SAP Hotline.

Error message extract from SAP system. Copyright SAP SE.

XS821 - Details

• The SAP error message XS821, which states "Cannot process message in node, parameters cannot be converted," typically indicates an issue with data type conversion or parameter handling in an SAP system, particularly in the context of SAP HANA or XS (Extended Services) applications. This error can occur when the system is unable to convert the parameters passed to a function or service into the expected data types.
  Causes:
  
  Data Type Mismatch: The parameters being passed to a function or service do not match the expected data types. For example, trying to pass a string where a number is expected.
  Invalid Input Values: The input values may not conform to the expected format or range, leading to conversion failures.
  
  Configuration Issues: There may be misconfigurations in the XS application or service that lead to incorrect parameter handling.
  Coding Errors: There could be bugs in the application code that lead to improper handling of parameters.
  
  Solutions:
  
  Check Parameter Types: