diff --git a/LuaLibs/ProcessSplit.lua b/LuaLibs/ProcessSplit.lua
index 9b65429..1493b6b 100644
--- a/LuaLibs/ProcessSplit.lua
+++ b/LuaLibs/ProcessSplit.lua
@@ -513,7 +513,7 @@ function ProcessSplit.Make( Proc, nPhase, nRawId, nPartId, nOrd, sDownOrSideOrSt
                         local dLastCutOffset = i * dOffsL
                         local vtMoveLimitingSurf = Vector3d( -dLastCutOffset + 10 * GEO.EPS_SMALL, 0, 0)
                         EgtMove( nLimitingSurf, vtMoveLimitingSurf, GDB_RT.GLOB)
-                        local vtNLimitingSurf = EgtSurfTmFacetNormVersor( nLimitingSurf, 0)
+                        local vtNLimitingSurf = EgtSurfTmFacetNormVersor( nLimitingSurf, 0, GDB_ID.ROOT)
                         if AreOppositeVectorApprox( X_AX(), vtNLimitingSurf) then EgtInvertSurf( nLimitingSurf) end
                      end
                      -- tagli verticali