C.E.B Cranfield, professor of theology at Durham University for much of the second half of the 20th century:
We take it that what Paul’s statement that God purposed Christ as a propitiatory victim means is that God, because in His mercy He willed to forgive sinful men and, being truly merciful, willed to forgive them righteously, that is, without in any way condoning their sin, purposed to direct against His own very Self in the person of His Son the full weight of that righteous wrath which they deserved.
C.E.B. Cranfiled, The Epistle to the Romans 1-8 (Vol. 1) (International Critical Commentary Series), p. 217