How To Fix PPC1DM321 - System error in RFC in the target system &1

PPC1DM321 - Overview

• Message type: E = Error

• Message class: PPC1DM - PP Backflush: Database Management and Communication

• Message number: 321

• Message text: System error in RFC in the target system &1

What causes this issue?

You want to compare data from the ERP System with data from the APO. To
do this, the system must read data from the APO System using an RFC. A
system error occurred in the APO target system &v1& when the system
accessed the function module BAPI_PPC_HDR_FLAG_READ. The following error
text was displayed:
&v2&&v3&

System Response

The affected data cannot be compared.

How to fix this error?

Depends on the content of the error text.

Procedure for System Administrators

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.

PPC1DM321 - Details

• The SAP error message PPC1DM321, which indicates a "System error in RFC in the target system &1," typically arises during Remote Function Call (RFC) communication between SAP systems. This error can occur due to various reasons, and understanding the cause is crucial for troubleshooting and resolving the issue.
  Possible Causes:
  
  Network Issues: There may be network connectivity problems between the source and target systems, leading to failed RFC calls.
  Configuration Errors: Incorrect configuration of the RFC destination in the SAP system can lead to this error. This includes issues with the connection parameters or the target system's settings.
  Authorization Issues: The user credentials used for the RFC call may not have the necessary authorizations in the target system.
  System Availability: The target system may be down or not reachable due to maintenance or other issues.
  Resource Limitations: The target system may be experiencing resource limitations (e.g., memory, CPU) that prevent it from processing the RFC request.
  Transport