The meaning of "not otherwise described"


Hi,

Could someone explain?

Is it easy to read the following statement?

ADV_FSP.6.7C The functional specification shall describe all error messages
contained in the TSF implementation that are not otherwise described in the
functional specification. [CC Part3 V3.0 Revision 2]

Here, I find the next two phrases (A and B) are combined into one.

A) The functional specification shall describe all error messages contained
in the TSF implementation.
B) those error messages are not otherwise described in the functional
specification.

Is "A" sufficient without "B", isn't it?
What additional condition be placed by "B"?

Thanks advanced!

Regards,
Hirofumi Yokota

smime.p7s



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