Thank you for taking the time to reach out to us here on the Community page, .

When changing an account for your products and services, the changes will only take effect for service and non-inventory items. For inventory types, the update will only take effect the future transactions after the update. As a workaround, you can reset up the item, then recreate your past entries.

For additional reference about managing your products and services, check out these articles:

• Adding Products and Services, Customers, and Vendors to Lists
• How to set up products & services

Let me know if you have any other questions. I'm a few clicks away to help. Have a good day!