Cannot Increment or Decrement Submaster

I am trying to make macros to increment and decrement the level of a sub by 1%, but the syntax that you would use to do so for a channel does not work. For example:
[Sub] [5] [0] [2] [At] [+] [0] [1] [Enter] or [Sub] [5] [0] [2] [At] [-] [0] [1] [Enter]

When you type the above examples into the command line, there is a syntax error as soon as you press [+] or [-]. If you make a macro with it, the [+] or [-] is just left out when it executes and it sets the submaster to a level of 01. Targeting the fader instead of the sub behaves the same.

I have tried this on Eos versions 2.8.3.11, 2.9.1.17, and 3.0.0.244.

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