Hello, 

For a customer I changed the digital precision from the Product Price to 4 digits. This works perfect on the product-form and on the sale order. The only problem is that the price-extra field from the product_template_attribute_line does not alters its precision. This field keeps its 2 digits. I checked the code of the field and it looks correct:

price_extra = fields.Float(string="Value Price Extra",
    default=0.0,
    digits='Product Price',
    help="Extra price for the variant with this attribute value on sale price. eg. 200 price extra, 1000 + 200 = 1200.")

Anyone had this problem or knows the solution? 

Thank you in advance for your help!