Dots in Software Update Groups names

Hello,

Do you know any reason why is it impossible to put a dot (".") in a name of Software Update Group? I can use dots in SUG's name created via ADR but not when I create one manually, I receive an error: "Must specify a valid name for the software update group".

How can I put dots in a names for manually created SUGs?

SCCM 5.00.7958.1000

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