Hi PhantomPE
Thanks for your post. I am sorry that you had that experience.
In this matter, The system will not allow you to change it. If you recorded sales or purchases for an item and then decide that you wish to inventory that item the system can't determine the quantity on hand and current value therefore you are unable to tick that option. You are unable to change or edit the item if it is already on sale or purchase.
The best recommendation for this is to create a new one. And I would also recommend having your accountant for the balances.
You can also check on this Help Article: Auto-Building items. I hope this helps.
Let me know if you require any further assistance with this. I'm happy to assist you.
If my response has answered your inquiry please click "Accept as Solution" to assist other users find this information.
Cheers,
Cel