This article outlines the database structure for the MMv4 product_add_ship_assoc database table.

• pid
  Reference to the product's SID number: product.id.
  int(10) | unsigned | indexed
• ship_method_id
  Reference to the shipping method's SID number: shipping_method.id.
  int(10) | unsigned | indexed
• value
  The numeric value of the additional shipping fee.
  double(16,2)
  
• type
  Determines whether the product_add_ship_assoc.value field is a dollar value or percentage of the original shipping fee.
  char(1) | Values: D,P | Default: D