Quick Slot Unit question

[Costa]

Would I be right in assuming that you cannot equip an S rank Slot Unit to a A rank Line Shield? I've got a perfectly good Rabol Rappy at the moment, and I cannot equip my shiny new Orpa / Force.

[Chuck_Norris]

Excactly. You need an S rank armor to use an S rank unit.

[Costa]

Oh joy. This will take a while.