from odoo import models

class StockMove(models.Model):
    _inherit = 'stock.move'

    def _should_bypass_set_qty_producing(self):
        """
        Prevent auto-update of consumed quantity if:
        - The move already has a quantity set (partial consumption).
        - The move is already picked.
        """
        if self.sudo().quantity > 0 or self.sudo().picked or self.sudo().manual_consumption:
            return True
        return super()._should_bypass_set_qty_producing()

    def write(self, vals):
        # Enforce manual usage flags if quantity is being set
        if 'quantity' in vals and vals['quantity'] > 0:
             vals['manual_consumption'] = True
             vals['picked'] = True
        return super().write(vals)