Hello there, @Roland12.
This post appears to be a duplicate of the one to which my colleague has replied. You can check this direct link to view her response and suggestions: https://quickbooks.intuit.com/learn-support/en-us/other-questions/re-why-are-bill-purchase-order-inv....
For future reference, feel free to visit the QuickBooks Online Help page. It contains helpful articles and video tutorials depending on your concern.
Keep in touch so we can assist you further with attachments or QuickBooks. Have a good one!
