Erroneous feedback shown when dot is used as a decimal separator in questions (german language)

The most of our courses are using german language, as it is also our system language. When trainer use a "numerical" question (we suppose, that the behavior in cloze questions will be the same) an erroneous feedback is given to the students who uses dots as decimal seperator (germany: comma).

The answer is evaluated correctly after submit, but at the summary of the attempt there is the message "incomplete answer" for the student.

This feedback may be confusing, although the answer is correct.