class equipment
name =fields.char
product_id = fileds.m2o product.product
line_id = domain by product id #!
class operation
name = fields.char
line_ids = fields.o2m model line
class line
product_id fields.m2o product product
@class equipment
how to show line_ids with domain match product_id?
i had to add many2one field @ class operation,
but I still need to context equipment id in class line!