odoo/odoo — pull request #1187 by rruebner (2014-07-15 16:18:25+00:00)
Title: [FIX] Removed readonly access for product accounting fields like property_account_income

This should fix the issue #729.

I think the is_product_variant field was taken to ensure a readonly access for product variants, so the accounting stuff can only be handled in the product template. But in my opinion the is_product_variant field has a strange behavior because it is true when the product variant count is 1, so we can't use it here.