fehlerhaft in English:

reports based on erroneous information

However, again, that could be an erroneous conclusion on his part.

You report erroneous sales figures.

An erroneous report earlier in the spring said Bush would be there.

This decision was based on the European Commission's erroneous market forecasts.

Rie has erroneous ideas.

There is something to be said for every error; but, whatever may be said for it, the most important thing to be said about it is that it is erroneous.

The fundamental problem in arguing with a person who denies global warming is that they use erroneous logic.

Hui Shi had many ingenious notions. His writings would fill five carriages; but his doctrines were erroneous and contradictory, and his words were wide of their mark.