Hello, 9130349860700486.

I have just the solution to help you with the error message when creating your statements. 

This message appears when the statement date covers no open invoices (based on the invoice date). To fix this, we'll want to ensure that the statement's Start date and End dates have open invoices. 

We would want to edit the Start Date and End Date parameters. If you're unsure about what dates to select, we'll want to go to your customer's Transaction List page, then check the invoice dates from there. 

Here's an article that'll give you more details about the Statements feature in QuickBooks: Create and send customer statements in QuickBooks Online. 

I'll also add an article in case you need help tracking your cash flow from sales: Track your cash flow in QuickBooks Online. 

Please let me know if there's anything else I can do for you about your statements. Need a hand on managing your expenses, running reports, or checking your data? Include the details to your reply and I'll help you out.