Payment Schedule pop-up

"Information - Turn on online payments to add a Payment Schedule"

I do not want or need Online Payments and turned it off and yet find the pop-up message keeps apprearing over the top of next screen, click the 'x' and it appears again & again & again............ if I do anything else in my invoice - beyond annoying

Later:

THIS IS URGENT - every time I click when competing an invoice despite clicking the 'x' to remove the pop up message - it reappears - so far I have a record of 12 times in 1 invoice. Plus if I don't delete it before sending it overlaps the bottom buttons to send. This is sending me into FRENZY - surely it can be turned off behind the scenes without needing to go before a 'review committee'?