I can see the importance of importing your Sales Orders (SO) from Katana into QuickBooks Online (QBO), info-printers. I can explain why you're receiving this error while importing into the program and route you to the best support to assist you further.

Since the ability to import sales orders is currently not an option in QBO, users can utilize other third-party applications to manage this type of transaction. These apps have limitations to follow for successful and smooth integration and importation of data into the program. 

Based on the error you received, you'll need to stick to the maximum string length of up to 21 lines to import your SOs. With this, I recommend reviewing your data before sending them to QBO. You may also contact Katana's Support team for further guidance on managing your data to comply with QuickBooks integration rules and limitations.

If you're curious about the specific information you can import or download in QBO, please refer to this article for more details: Common questions about importing data to QuickBooks Online.

Additionally, to aid you in exporting data outside QuickBooks, here are some helpful links:

• Move your lists to QuickBooks Online.
• Export reports, lists, and other data from QuickBooks Online.

Please let me know if you have other concerns or questions about importing Sales orders or other QuickBooks-related matters. I'm here to assist you in sorting things out.