Question: Adding Units of Information

I have had success adding units of distance in Maple using the example in the documentation.  However when I perform an addition on units of information such as gibibytes and mebibytes I receive:

"Error, (in Units:-Standard:-+) cannot represent the given unit in the system `SI`"

This behavior seems to be an ugly little non-orthogonality in the Maple language.  I have posted a test case to my files.  I did try the other systems beyond SI however this did not affect the behavior.

Test Case

Am I using the units incorrectly or might this be an opportunity for an enhancement request?

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