key binding confusion

["Jay Moore" <jaymo@xxxxxxxxxxxx>]

I've written a macro that performs a series of functions on a message,
and bound it to the f10 key:

macro index "<f10>" "<pipe-message>relaydb -b<enter><other stuff>"

Now I want to be able to "undo" the series of functions performed above,
so I thought, "I'll use SHIFT + F10 to undo what I did with F10".  I've
tried every combination I can think of, but cannot get this key sequence
bound. I've googled, & read till my eyes are bleeding :)

Is SHIFT + F10 possible? If so, how do I specify it in my macro?

Thanks,
Jay