We propose to measure the beam and target analyzing powers and spin correlation parameter A in elastic pp scattering by using the transversely polarized proton beam and target, at momentum p = 45 GeV/c. Such a study will allow us to test experimentally the equality of polarization to analyzing power. This equality has been theoretically proven and is widely used for extraction the polarization observables with unpolarized beam and polarized target. One needs to use both polarized beam and target to measure simultaneously A , A and A .