The creative relation is not extra-mentally additional to the Creator and that which is created. In other words, when Allah ﷻ creates a contingent, there does not emerge a third existent called “creating” between Him and that which He creates.
Rather, this “creating” is a conception in the mind of the one who realizes that the Creator brought the contingent into existence at that moment. And all what exists extra-mentally is the Creator, and that which He creates.
Imam Fakhr Al-Deen Al-Razi proves this in his Al-Matalib Al-‘Alia. The Imam writes:
|If the affecting were an existent quality, additional to the being of the Effecter and its effect, we ask: is the Effecter affecting the effect or not?
If the first [i.e. the Effecter is affecting its effect]: then there must not exist an intermediary between the Effecter and its effect. Except that this cannot be the case if relations existed extra-mentally. Since the creative relation between the Effecter and its effect would be an intermediary. Entailing that there both exist and not-exist an intermediary between the Effecter and its effect, which is impossible.
If the second [i.e. the Effecter is not affecting its effect]: then the Effecter would not be an effecter, and this is also impossible.
– Al-Razi, Al-Matalib Al-‘Alia (Vol. 4, pg. 264)
Thus, the creative relation does not exist extra-mentally. It is an extracted abstraction existing in the mind of the one who realizes that a contingent emerged at a moment in time, and that Allah ﷻ is the one who brought this contingent into existence at that moment.
 “Affecting” meaning: the creative relation. The “creating”. The fact that Allah ﷻ created the effect.
 The “Effecter” is Allah ﷻ, who brought the contingent into existence. The “effect” is that contingent which was brought into existence.
 If such an intermediary existed, then Allah ﷻ wouldn’t be the Effecter. Instead, the effecter would be that intermediary. In other words, if the “creating” were something that existed between Allah ﷻ and what He creates, then this “creating” would be what brought the contingent into existence, not Allah ﷻ.
 Furthermore, if the “creating” were something that occurs between Allah ﷻ and that which He creates, then this “creating” would need to be brought into existence by Allah ﷻ. Entailing the emergence of a second creative relation between Allah ﷻ and the first creative relation (the creating of the creating).
And the emergence of this second creative relation would entail the emergence of a third creative relation for the exact same reason.
And the emergence of a third creative relation, entails the emergence of a fourth. And so on and so forth, ad infinitum. Entailing Tasalsul, which is impossible.