If I say "maximize +equip BACKITEM1 +equip BACKITEM2", obviously, it can't fulfill that, since you only have one "back" slot. Accessories, sure - you can take two slots.
What does it do?
- give an error and do nothing
- take the first and ignore the second (with or without an error)
- take the second and ignore the first (with or without an error(
What SHOULD it do?