Hi,

There is an onchange function (onchange_operation_type) in Addons, which change the Source location and Destination Location when changing the field type. You can override this function to set the default values.@api.onchange('type')
    def onchange_operation_type(self):
        """ On change of operation type it sets source location, destination location
        and to invoice field.
        @param product: Changed operation type.
        @param guarantee_limit: Guarantee limit of current record.
        @return: Dictionary of values.
        """
        if not self.type:
            self.location_id = False
            self.location_dest_id = False
        elif self.type == 'add':
            self.onchange_product_id()
            args = self.repair_id.company_id and [('company_id', '=', self.repair_id.company_id.id)] or []
            warehouse = self.env['stock.warehouse'].search(args, limit=1)
            self.location_id = < Desired location you prefer>
            self.location_dest_id = < Desired location you prefer>
        else:
            self.price_unit = 0.0
            self.tax_id = False
            self.location_id = < Desired location you prefer>
            self.location_dest_id = < Desired location you prefer>
By overriding this Onchange function, you can simply set the desired location according to you

Hope it helps