Jonas Club has restrictions on the number of characters within the Invoice Number. They can only be between 6 - 10 characters, including symbols and spaces. Upon import into Jonas, invoice numbers will have leading 0's added if they are less than 6 characters, and will error out if it is over 10 characters. This causes invoice numbers to be mismatched between Beanworks and Jonas, and will create sync errors or unmatched payments later on. To prevent this from happening, the best thing to do is to make sure the restrictions are replicated within Beanworks.
Go to Settings - Invoices - Coding Fields. You will be able to set the Min Length and Max Length of the Invoice # field here:
With these settings completed, if you try to enter in an invoice number outside of those parameters, you will get the following message upon trying to Submit the invoice for approval: