I don't understand why we added the code line item to INV05 module. I deleted that line item and I was able to complete the import process without a problem (I changed the time format to MMM YY).
However, I am getting errors in the presence of the code line item. I got the error "Invalid date or timescale identifier". When I changed the time format to MMM YY while importing then I got the error "Expected abbreviated month name in date/period".
So why need a code line item and how can I fix the errors?