Redmine

I can't make related a bug that is from a project (A) to another project (B): redmine alert me with "« Related issue » doesn't belong to the same project" message.

But this isn't real because if I create a root project and some child project, I can't refer to a change in project root that requires change also in subproject.

For example:

• project root is a presentation layer;
• project child (subproject) is a data abstraction layer;
• another project child (subproject) is some *.dll helper;

I think that as in other tool as bugzilla from any ticket I should be able to refer to another ticket, without cloase that both are related to same project.