It seems like you are facing a security restriction error while trying to add a product in the order line of sales quotation in Odoo15. The error message suggests that you do not have access to the 'Product' records due to security restrictions. 

One possible solution would be to check your user permissions in Odoo and ensure that you have the necessary access rights to create and edit products. You can do this by going to the 'Settings' menu in Odoo, clicking on the 'Users & Companies' option, and then selecting your user account. From there, you can check your access rights and adjust them if necessary.

Another solution could be to contact your Odoo administrator and request access to the 'Product' records, as suggested in the error message. They may be able to adjust your permissions or provide you with the necessary access to resolve the issue.

Hi,

I think there is some record rules/restriction added for the product model in your odoo instance/database, please go through the record rules and see if you have proper rights to view the products.

Thanks