Hi Andrey,
CX/MSS/R158(D)6 is just a strength return for 10 April 1944, and CX/MSS/T159/59 notes: "Advanced detachment Mamaia and Chersones". I can send you these pages via email if you like.
Cheers,
Andrew A.
Air War Publications -
www.airwarpublications.com/earticles