What do the Action Points in the equipment section mean?

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There are action points shown in inventory menu for each equipment piece. Does that mean that, for example, if it shows 5AP - I need to have that 5AP to wear that piece of equipment? Seems that that number is not a penalty as it doesn't reduce my total action points in battle.
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Best use for Action Points in Rise of Kingdoms [ACTUAL DATA for max value]
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