diff --git a/LuaLibs/RunMachParamFromSWCalc.lua b/LuaLibs/RunMachParamFromSWCalc.lua
index d281bd0..bb57aa2 100644
--- a/LuaLibs/RunMachParamFromSWCalc.lua
+++ b/LuaLibs/RunMachParamFromSWCalc.lua
@@ -62,7 +62,7 @@ function RunMachParamFromSWCalc.Exec()
       local nLayerQty = EgtGetInfo( nLastLayerId, KEY_SLICE_NBR, 'i')
       -- ciclo sui layer
       local nLayerIndex = 1
-      local nLayerId = EgtGetFirstNameInGroup( nPartId, SLICE_LAYER .. nLayerIndex)
+      local nLayerId = EgtGetFirstNameInGroup( nPartId, SLICE_LAYER .. nLayerIndex) or EgtGetFirstNameInGroup( nPartId, "__" .. SLICE_LAYER .. nLayerIndex)
       while nLayerId do
          -- rimuovo eventuale info precedente del tempo di attesa
          EgtRemoveInfo( nLayerId, KEY_WAITING_TIME)
@@ -172,7 +172,7 @@ function RunMachParamFromSWCalc.Exec()
          -- aggiorno interfaccia
          EgtProcessEvents( 400 + ( nLayerIndex / nLayerQty * 100), 0)
          nLayerIndex = nLayerIndex + 1
-         nLayerId = EgtGetFirstNameInGroup( nPartId, SLICE_LAYER .. nLayerIndex)
+         nLayerId = EgtGetFirstNameInGroup( nPartId, SLICE_LAYER .. nLayerIndex) or EgtGetFirstNameInGroup( nPartId, "__" .. SLICE_LAYER .. nLayerIndex)
       end
       if nMaxIndex < nLayerIndex then nMaxIndex = nLayerIndex end
       nPartId = EgtGetNextPart( nPartId)