This is a situation where you need to edit the CSV file.

My suggestions are:

Save the CSV file and open it using windows notepad and compare it with /block eXport entry from your books (MC account target account) and note the differences to import using /Block Import.

Another alternative is run the procedure EXPTRANS on a transaction from the MC account and file compare the CSV file with the file created with EXPTRANS and match the file syntax to use with the procedure IMPORT.

I hope this helps.

Regards to All,