  In a bent crystal the $P$-odd effect of short-lived baryon spin rotation
could imitate spin rotation caused by assumed EDM. Use of different behavior of
$P$-odd and $T$-odd spin rotations at crystal turning around the direction of
particle momentum makes it possible to exclude $P$-odd rotation contribution,
when measuring short-lived baryons EDM. Subtraction of the measurement results
for angle ranges $\varphi$ and $\varphi + \pi$ from each other enables
measuring $T$-odd rotation at scattering of negatively charged beauty and
neutral baryons by axes of unbent crystal.
