diff --git a/intranet/modules/impression/static/impression.js b/intranet/modules/impression/static/impression.js
index 15895bba..9a8bcb09 100644
--- a/intranet/modules/impression/static/impression.js
+++ b/intranet/modules/impression/static/impression.js
@@ -148,11 +148,16 @@ Impression.settings.update = function () {
    this.getCopies(this.theform.nb_copies);
    this.getValue(this.theform.agrafage);
    // Contraintes
-   if (
-       /* ( this.papier != "A4" ) || */
-       ( (this.disposition_recto.checked) && (this.nb_pages>50) ) ||
-       ( (this.disposition_rectoverso.checked) && (this.nb_pages>100) )||
-       ( (this.disposition_livret.checked) && (this.nb_pages>60) )
+   if (Impression.settings.nb_pages > 60)
+       { this.disableField(this.theform.disposition_livret);
+	   this.theform.disposition_livret.checked = false }
+   if ( ((this.papier == "A4") &&
+	 (( (this.theform.disposition_recto.checked) && (Impression.settings.nb_pages>50) ) ||
+	  ( (this.theform.disposition_recto_verso.checked) && (Impression.settings.nb_pages>100) ) ))
+       ||
+	((this.papier == "A3") &&
+	 (( (this.theform.disposition_recto.checked) && (Impression.settings.nb_pages>30) ) ||
+	  ( (this.theform.disposition_recto_verso.checked) && (Impression.settings.nb_pages>60) ) ))
        )
      {
 	this.setValue(this.theform.agrafage, "None");