How mirror object by x

I generate gameobjects with meshes from xml and I need mirror by x result (gameobjects). I try use localscale x = -1, but then batching broken. I try use vert.x = -assignValue ( assignValue from xml) - then generate, but get result some http://prntscr.com/939t2j, but need result http://prntscr.com/939unu