Hi There SMDC_Sam,
Looks like you've already spoken to a member of our support team since you initially posted this - But just wanted to follow up and see how things are going.
Firstly - you mention that 'We were initially attempting to add a field for a Purchase Order number to our invoices before we realized that QuickBooks has that field and Method was just not showing it'
Where were you seeing this field? At this time - 'PO' is not a field that is contained on a stock QBO or Method Invoices Table. was it a custom Field perhaps?
Certainly strange that the stock screens broke however! I understand they were working again when our team reached out, but Keep an eye on it and let me know if it breaks again and Ill be happy to take a look.
Thanks SMDC_Sam.
Regads,
Ben