If you have maxed out technology skills, you can be in a number of given ability is limited, artisans level (Rom Gold) to level 6, skillful is limited to 3 skill level, only one master layer, and you want to promote skill of other skills, tires, you must first reduce your current skills.
For example, if your mining forging, carpentry technology has reached proficient level, but you want to improve your armor crafting skills proficient level (Runes of Magic Gold), you must first demote or mining, forging and carpentry craftsmen. Only you can improve your armor crafting skill level of proficiency.
Once you have demoted a skill's tier that skill's level will drop to the upper limit of its new tier level in