diff --git a/MP-TAB/WebUserControls/mod_confProd.ascx.cs b/MP-TAB/WebUserControls/mod_confProd.ascx.cs
index 4371f4eb..53d83a2e 100644
--- a/MP-TAB/WebUserControls/mod_confProd.ascx.cs
+++ b/MP-TAB/WebUserControls/mod_confProd.ascx.cs
@@ -404,6 +404,7 @@ namespace MoonProTablet.WebUserControls
     /// <param name="e"></param>
     protected void txtNumPezzi_TextChanged(object sender, EventArgs e)
     {
+      lblOut.Text = "";
       updatePzBuoni();
     }
     /// <summary>
@@ -434,6 +435,7 @@ namespace MoonProTablet.WebUserControls
     /// <param name="e"></param>
     protected void txtNumLasciati_TextChanged(object sender, EventArgs e)
     {
+      lblOut.Text = "";
       updatePzBuoni();
     }
     protected void ddlSubMacc_SelectedIndexChanged(object sender, EventArgs e)