The orthodox Catholic notion of communicatio idiomatum holds that:
The human and the divine activities predicated of Christ in Holy Writ and in the Fathers may not be divided between persons or hypostases, the Man-Christ and the God-Logos, but must be attributed to the one Christ, the Logos become Flesh . . . It is the Divine Logos, who suffered in the flesh, was crucified, and rose again . . .
(Ludwig Ott, Fundamentals of Catholic Dogma, p. 144)
Christ’s Divine and Human characteristics and activities are to be predicated of the one Word Incarnate. (De fide.)
As Christ’s Divine Person subsists in two natures, and may be referred to either of those two natures, so human things can be asserted of the son of God and Divine things of the Son of Man.
The old Lutheran Doctrinal Theology theology inclines to the monophysitic error which posits a real transference of Divine attributes such as omniscience, omnipotence, ubiquity, by reason of the Hypostatic Union, to the human nature of Christ, and teaches that “Christ, not only as God, but also as man knows all, can do all, and is present to all created things” (formula concordiae I 8, 11).
(Ott, p. 160)
The nature of the Hypostatic Union is such that while on the one hand things pertaining to both the Divine and Human nature can be attributed to the person of Christ, on the other hand things specifically belonging to one nature cannot be predicated of the other nature. Since concrete terms (God, Son of God, Son of Man, Christ the Almighty) designate the Hypostasis and abstract terms (Godhead, humanity, omnipotence) the nature, the following rule may be laid down: communicatio idioamatum fit in concreto, non in abstracto. The communication of idioms is valid for concrete terms not for abstract ones. So, for example: The Son of Man died on the Cross; Jesus created the world. The rule is not valid if . . . the concrete term is limited to one nature. Thus it is false to say “Christ has suffered as God.” “Christ created the world as a human being.” It must also be observed that the essential parts of the human nature, body and soul are referred to the nature, whose parts they are. Thus it is false to say: “Christ’s soul is omniscient,” “Christ’s body is ubiquitous.”
Further, predication of idioms is valid in positive statements not in negative ones, as nothing may be denied to Christ which belongs to Him according to either nature. One, therefore, may not say: “The Son of God has not suffered,” “Jesus is not almighty.”
(Ott, p. 161; italics added)
http://socrates58.blogspot.com/2007/11/orthodox-catholic-christology.html