Can Spiritjaws be used to grapple a manifested ghost or an incorporeal creature?
On the one hand incorporeal subtype says that incorporeal creatures can't be grappled. On the other hand force effects generally ignore incorporeality. So which one overrides the other?
I tend to think (but I'm still in doubt) that incorporeal creatures can't be grappled no matter what. But even if it is true, what about manifested ghost? Manifestation description says that manifested ghost "remains partially on the Ethereal Plane, where is it not incorporeal". So should Spiritjaws be able to grapple it's ethereal part?
RC based answers are OK, but try to provide core answer also, please. I am generally skeptical about RC.