Quest Issue: Oracle of K'Arnon & Book of Scale

[Heebee]

When asking the Oracle:

"what book of scale"

he responds with:

"Ah, the Book of Scale.. It would be wondrous indeed if you could recover the Book of Scale for me. If you do manage to procure the Book of Scale, I will gladly part with an artifact of my own that may be of interest to you."

when I handed him the Book of Scale he handed it back and said:

"I have no need for this item, Heebee. You can have it back."

Can I assume this part of the quest is not implemented until the release of the Plane of Sky?