When you map your Ink materials to Idemat values in the data management tab in your right main menu, it shows an automatic 'unspecified production process value' under 'production method'.

This is not a bug! Ink values in Idemat are the only values where the environmental impact of most production processes have already been incorporated in the first Idemat LCI value - in the second row. This is purely due to how Idemat is structured for inks.

This means, the production process is always taken into account for your inks.