1) I'm using Addon Vendor (version 2.5.2) and apparently the "Add product" option doesn't validate required fields (both in back-end as in front-end)
For ex. it's possible to insert a product without name, or price or quantity.
2) Although the product price is defined in the table as decimal(12,2), system saves it rounded.
For ex: if user fills out the price 100,75€, system saves as 101€.