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:
IF &DEVICE&='SCREEN'
<DS:TRAN.WE21>Execute function</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.