The changeset 3a0931d04904 added a readonly states but the description is a
substitut to the product so it should be readonly like the product.
Closes#12555
(grafted from 940abe6442e1dda8ef6c0d8a9bc981fa27bf6151)
--HG--
branch : 6.0
This is needed to have requests ordered also when grouping them into purchase
line.
Closes#12073
(grafted from d90d4ee0a2cab5faf93d565d3e92e2e3aab17e8b)
--HG--
branch : 6.0