diff --git a/LuaLibs/MachiningLib.lua b/LuaLibs/MachiningLib.lua
index 8e9a543..4c8327d 100644
--- a/LuaLibs/MachiningLib.lua
+++ b/LuaLibs/MachiningLib.lua
@@ -335,6 +335,7 @@ end
 function MachiningLib.AddOperations( vProc, Part)
    local nErr
    local sErr = ''
+   local bAreAllMachiningApplyOk = true
 
    for i = 1, #MACHININGS do
       -- creazione lavorazione
@@ -476,16 +477,16 @@ function MachiningLib.AddOperations( vProc, Part)
 
          local bIsApplyOk = MachiningLib.ApplyMachining( true, false)
          if not bIsApplyOk then
+            bAreAllMachiningApplyOk = false
             nErr, sErr = EgtGetLastMachMgrError()
             EgtSetOperationMode( nOperationId, false)
-            return false, sErr
          end
       else
-         return false, sErr
+         return false, 'UNEXPECTED ERROR: Error on creating machining'
       end
 
    end
-      return true, sErr
+      return bAreAllMachiningApplyOk, sErr
 end
 
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