Error occurred during import
Message no. SO424
Diagnosis
An error occurred during the import of a file.
System Response
The import was not carried out
Procedure
If the document is still open in the application, you need to close it before you carry out a new import.
This error message may indicate a SAP-GUI problem. The cause could be an error during data conversion, for example. Report the error to your system administrator.
Reference
SAP Note 2599578 – Create Attachment with .csv extension, SO424 Error occurred during import / 1R557 Content-Type msexcel2 is not permitted