The record may fail to send to FreeAgent due to the CIS%.
In order for this to send, please set the nominal code for the CIS line item to be the correct code.
Based on the following:
061 = 0%
062 = 20%
063 = 30%
If you do not have these as nominal codes you will need to add them in system settings - Add nominal code
Then resend the invoice to the accounting package.