How To Fix E0121 - Error at OPEN '&' (check file)

E0121 - Overview

• Message type: E = Error

• Message class: E0 - SAP EDI messages

• Message number: 121

• Message text: Error at OPEN '&' (check file)

What causes this issue?

An error occurred while opening a status file with 'OPEN DATASET'! The
system then tried to open the file &V1& which was specified via
parameters with the start of status processing.
An error occurred.
The system then tried to open file &V2& that was specified in the port
definition of port &v4& for status inbound processing. This also leads
to an error!

System Response

Confirmation of operating system when opening file &v1&:
&v3&

How to fix this error?

Please compare the following file names with the name of the status
file provided by your EDI subsystem:
&v1& - transferred file
&v2& - file configured in the port for status inbound processing
Check the port configuration:

<DS:TRAN.WE21>Execute function</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.

E0121 - Details

• The SAP error message E0121, which states "Error at OPEN '&' (check file)," typically indicates that there is an issue with opening a file in the SAP system. This error can occur for various reasons, and understanding the cause is essential for finding a solution. Here are some common causes, potential solutions, and related information:
  Causes:
  
  File Path Issues: The specified file path may be incorrect or the file may not exist at the specified location.
  File Permissions: The user or the SAP system may not have the necessary permissions to access the file.
  File Locking: The file may be locked by another process or user, preventing SAP from accessing it.
  Network Issues: If the file is located on a network drive, there may be connectivity issues or the network drive may not be accessible.
  File Format: The file may be in an unsupported format or corrupted.
  
  Solutions:
  
  Check File Path: Verify that the file path specified in