diff --git a/htdocs/core/modules/bom/modules_bom.php b/htdocs/core/modules/bom/modules_bom.php
index d1f00a27e9f..9e5ce0346ca 100644
--- a/htdocs/core/modules/bom/modules_bom.php
+++ b/htdocs/core/modules/bom/modules_bom.php
@@ -93,4 +93,11 @@ abstract class ModeleNumRefBoms extends CommonNumRefGenerator
 	 *  @return string|int<-1,0>		Next value if OK, 0 if KO
 	 */
 	abstract public function getNextValue($objprod, $object);
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/cheque/modules_chequereceipts.php b/htdocs/core/modules/cheque/modules_chequereceipts.php
index 94ccd9dcd85..1137a17cc05 100644
--- a/htdocs/core/modules/cheque/modules_chequereceipts.php
+++ b/htdocs/core/modules/cheque/modules_chequereceipts.php
@@ -46,6 +46,13 @@ abstract class ModeleNumRefChequeReceipts extends CommonNumRefGenerator
 	 *  @return	string|int<-1,0>			Next value if OK, 0 if KO
 	 */
 	abstract public function getNextValue($objsoc, $object);
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
 
 /**
diff --git a/htdocs/core/modules/commande/modules_commande.php b/htdocs/core/modules/commande/modules_commande.php
index 7f0f1456189..a0d1f4eda9e 100644
--- a/htdocs/core/modules/commande/modules_commande.php
+++ b/htdocs/core/modules/commande/modules_commande.php
@@ -111,4 +111,12 @@ abstract class ModeleNumRefCommandes extends CommonNumRefGenerator
 	 *  @return string|int<-1,0>		Value if OK, -1 if KO
 	 */
 	abstract public function getNextValue($objsoc, $object);
+
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/contract/modules_contract.php b/htdocs/core/modules/contract/modules_contract.php
index 0a5f96ada52..65fab16a192 100644
--- a/htdocs/core/modules/contract/modules_contract.php
+++ b/htdocs/core/modules/contract/modules_contract.php
@@ -90,4 +90,11 @@ abstract class ModelNumRefContracts extends CommonNumRefGenerator
 	 *	@return string|int<-1,0>  			Next value if OK, -1 or 0 if KO
 	 */
 	abstract public function getNextValue($objsoc, $contract);
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/delivery/modules_delivery.php b/htdocs/core/modules/delivery/modules_delivery.php
index c1f919924f6..fc843e4ebd4 100644
--- a/htdocs/core/modules/delivery/modules_delivery.php
+++ b/htdocs/core/modules/delivery/modules_delivery.php
@@ -88,4 +88,11 @@ abstract class ModeleNumRefDeliveryOrder extends CommonNumRefGenerator
 	 *  @return string|int<-1,0>  		Value if OK, 0 or -1 if KO
 	 */
 	abstract public function getNextValue($objsoc, $object);
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/expedition/modules_expedition.php b/htdocs/core/modules/expedition/modules_expedition.php
index 6e606571fda..8707d0a5473 100644
--- a/htdocs/core/modules/expedition/modules_expedition.php
+++ b/htdocs/core/modules/expedition/modules_expedition.php
@@ -91,4 +91,11 @@ abstract class ModelNumRefExpedition extends CommonNumRefGenerator
 	 *	@return string|int<-1,0> 		Value if OK, 0 or -1 if KO
 	 */
 	abstract public function getNextValue($objsoc, $shipment);
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/expensereport/modules_expensereport.php b/htdocs/core/modules/expensereport/modules_expensereport.php
index 64d5a4c4a27..a9c08ac17ed 100644
--- a/htdocs/core/modules/expensereport/modules_expensereport.php
+++ b/htdocs/core/modules/expensereport/modules_expensereport.php
@@ -91,4 +91,11 @@ abstract class ModeleNumRefExpenseReport extends CommonNumRefGenerator
 	 *  @return string|int<-1,0>   			Next value if OK, -1 or 0 if KO
 	 */
 	abstract public function getNextValue($object);
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/facture/modules_facture.php b/htdocs/core/modules/facture/modules_facture.php
index 586e7f8a414..128b63168ec 100644
--- a/htdocs/core/modules/facture/modules_facture.php
+++ b/htdocs/core/modules/facture/modules_facture.php
@@ -277,4 +277,11 @@ abstract class ModeleNumRefFactures extends CommonNumRefGenerator
 	 * @return  string|int<-1,0>		Value if OK, <=0 if KO
 	 */
 	abstract public function getNextValue($objsoc, $invoice, $mode = 'next');
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/member/modules_member.class.php b/htdocs/core/modules/member/modules_member.class.php
index 6b8ba978811..d9835a3789e 100644
--- a/htdocs/core/modules/member/modules_member.class.php
+++ b/htdocs/core/modules/member/modules_member.class.php
@@ -90,8 +90,6 @@ abstract class ModeleNumRefMembers extends CommonNumRefGenerator
 	 */
 	public function getToolTip($langs, $soc)
 	{
-		global $conf;
-
 		$langs->loadLangs(array("admin", "companies"));
 
 		$strikestart = '';
@@ -138,4 +136,11 @@ abstract class ModeleNumRefMembers extends CommonNumRefGenerator
 	{
 		return '';
 	}
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }
diff --git a/htdocs/core/modules/mrp/mod_mo_advanced.php b/htdocs/core/modules/mrp/mod_mo_advanced.php
index 3c8e8bae564..255a3e6da43 100644
--- a/htdocs/core/modules/mrp/mod_mo_advanced.php
+++ b/htdocs/core/modules/mrp/mod_mo_advanced.php
@@ -61,7 +61,7 @@ class mod_mo_advanced extends ModeleNumRefMos
 	 */
 	public function info($langs)
 	{
-		global $conf, $langs, $db;
+		global $langs, $db;
 
 		$langs->load("bills");
 
diff --git a/htdocs/core/modules/mrp/modules_mo.php b/htdocs/core/modules/mrp/modules_mo.php
index 1e9955a27b1..ca5b84fb7c7 100644
--- a/htdocs/core/modules/mrp/modules_mo.php
+++ b/htdocs/core/modules/mrp/modules_mo.php
@@ -89,4 +89,12 @@ abstract class ModeleNumRefMos extends CommonNumRefGenerator
 	 *  @return string|int<-1,0>		Value if OK, <=0 if KO
 	 */
 	abstract public function getNextValue($objprod, $object);
+
+
+	/**
+	 *  Return an example of numbering
+	 *
+	 *  @return     string      Example
+	 */
+	abstract public function getExample();
 }