Hello Stonelock,

you can create a new decimal accuracy for your purchase order price unit like this.

<record id="decimal_new_purchase_price" model="decimal.precision">

    <field name="name">Purchase Price</field>

    <field name="digits" eval="4"/>

</record>

Then you need to override the Price Unit of the Purchase Order Line and change the decimal precision to this one that you have created right now like this:

class PurchaseOrderLine(models.Model):

    _inherit = 'purchase.order.line'

    price_unit = fields.Float(string='Unit Price', required=True, digits='Purchase Price')