Hi
If your project/ WBS is capable of holding the stock (valuated) then it will be stock -> stock otherwise it will hit the consumption account (showing that stock has been consumed to project which should be settled finally).
Check the WBS to which you are posting 412Q if it holds valuated stock or not.
There are two types of postings can be possible with 412Q depending on project settings (one posting to stock and other posting to consumption of project with indicator P).
And the GL in screenshot is set up as cost element which requires an assignment of CO object (say WBS/ order/ cost center) for postings.
Also check the profile of the project whether valuated stock option is set and requirements grouping option is not set etc.