Hi sc_spl Jcarrier
Importing 550 lines as one journal makes it difficult to pinpoint the line that is causing the error. Perhaps try breaking it down to smaller Journals (Part 1 of 10 for example).
A few basics:
Export 2 existing General Journals and use this export as a guide
Save a tab delimited rather than CSV
Open in Notepad and add {} to first line
Use Notepad to edit and replace " with nothing (quotes with nothing) this will remove any quotes added by Excel in the saving process
Break into smaller chunks
Ensure your column Order matches the order of the template
Regards
Gavin