If you are wondering how to solve QuickBooks Error 176109 - Invalid Product Number or Code. It is the error which arises when you try to open QuickBooks point of sale. QuickBooks needs enough permission to read/write the files without any interruption. It occurs because the contents of the point of Sale Entitlement folder are missing or damaged. There are different solutions like Delete the contents of the Entitlement Client folder, Renaming the WSActivity file, and there are many more. For more details https://www.accountwizy.com/quickbooks-error-176109/ For any expert advice contact +18773550435