Allowing ITS in CTR extension?

In the CTR module (section 5.6.4.4 revision) there is a new constraint related
to ITSM:

"The following XLIFF Module attributes are explicitly allowed by the wildcard
other: ."

I'm not sure I understand: if CTR is just the same as in 2.1 it should not have
such change. Introducing a new attribute and
constraint would require to change the CTR version.