When you map your Ink materials to Idemat values in, 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.