The Scar Seeker prestige class includes a feature (Enduring Scar - Mercy) which allows a Paladin to add a Mercy to a casting of Lay on Hands which they do not have but "for which he qualifies". I find it a bit confusing that they did not use the term "for which he meets the prerequisites", which is more in-line with the rest of the rules.
In my mind, there's two possible readings of this:
The Paladin is able to expend a daily usage of the Enduring Scar class ability to add any mercy for which they have the required level, since they technically "qualify" to cast it.
The Paladin is able to expend a daily usage of the Enduring Scar class ability to add any mercy for which they have the required level as well as any prerequisite mercies. This seems slightly more in line with the wording, but it would also encourage picking all other mercies with the sole intent to unlock as many as possible, which seems undesirable.
Is there any rules or errata that explain the exact meaning of the word "qualifies" in this context? Thank you for any pointers or opinions.
Context: This came up in a campaign I'm GMing where the Paladin is pondering to pick the above class feature.