Hi Jurgen,
I as thinking the same if info update makes sense. However, why then it is possible to select the info update manually. In your case the info update tick did not disappear because probably a standard info record exist for this material-vendor.
If you try with a material that no info record exists at all, then the info update tick will disappear.
So i suppose automatically it is not possible to have the info update for consignment.
BR