BO designer: Divergences in Check cardinalities

In my opinion we may have divergences in BO designer during the cardinalities check when:

We have multilanguage selection during the query. This table has two primary keys, the code and the language. For this, bo thinks there are two rows for each N row in another table, so it thinks you have a N by N relationship. We don't select the code at this point because the user will select when creating the query:

*the part circled was introduced by me after the checking. if I hit detect button it says ok.
clang='EN'

, the error is :"cardinality is not valid" because i forced 1 by N relationship and BO checks and see N by N relationship due to the lack of the language.