How To Fix DU203 - Error occurred in CPIC & communication

DU203 - Overview

• Message type: E = Error

• Message class: DU - Data transfer to SAP-EIS

• Message number: 203

• Message text: Error occurred in CPIC & communication

What causes this issue?

An error occurred during CPIC communication with another system.

System Response

Communication was terminated with internal error code &v2&.

How to fix this error?

Check the SAP-EIS transfer log.
Check the system log and dump analysis in the target system.
Check the gateway system log.
If the system log does not indicate the cause of the error, you can
trace CPIC communication in the R/2 system using transaction 'TRAC'.
A higher trace level can be set at network level for the gateway. The
parameter is rdisp/trace = 2.
Possible errors are:
The transfer structure (sender program) has not been correctly
maintained and generated.
The transfer rules have not been maintained.
The sideinfo table has not been maintained (see Basis manual SAP
Communication).
The user in the target system under whose name the system is logged on
is not authorized for CPIC or is not in the correct client.

Error message extract from SAP system. Copyright SAP SE.

DU203 - Details

• The SAP error message DU203 indicates that there is a problem with the communication between the SAP system and an external system or service, typically related to the CPIC (Common Programming Interface for Communication) layer. This error can occur due to various reasons, including network issues, configuration problems, or issues with the external system itself.
  Causes of DU203 Error
  
  Network Issues: Problems with the network connection between the SAP system and the external system can lead to communication failures.
  Configuration Errors: Incorrect settings in the SAP system or the external system can cause communication issues. This includes incorrect RFC (Remote Function Call) destination settings.
  Firewall Restrictions: Firewalls may block the necessary ports for communication between systems.
  External System Down: The external system that SAP is trying to communicate with may be down or experiencing issues.
  SAP Kernel Issues: Sometimes, issues with the SAP kernel or outdated components can lead to communication errors.
  User Authorization: Lack of proper