diff --git a/htdocs/adherents/class/adherent.class.php b/htdocs/adherents/class/adherent.class.php
index 1aad39954fc..06a5aa3e598 100644
--- a/htdocs/adherents/class/adherent.class.php
+++ b/htdocs/adherents/class/adherent.class.php
@@ -2404,7 +2404,7 @@ class Adherent extends CommonObject
 		$this->country_id = 1;
 		$this->country_code = 'FR';
 		$this->country = 'France';
-		$this->morphy = 1;
+		$this->morphy = 'mor';
 		$this->email = 'specimen@specimen.com';
 		$this->skype = 'skypepseudo';
 		$this->twitter = 'twitterpseudo';
diff --git a/htdocs/asset/class/asset.class.php b/htdocs/asset/class/asset.class.php
index 8e9e31e68b2..37aeb4607c8 100644
--- a/htdocs/asset/class/asset.class.php
+++ b/htdocs/asset/class/asset.class.php
@@ -163,9 +163,9 @@ class Asset extends CommonObject
 	 */
 	//public $class_element_line = 'Assetline';
 	/**
-	 * @var array  Array of child tables (child tables to delete before deleting a record)
+	 * @var array	List of child tables. To test if we can delete object.
 	 */
-	//protected $childtables=array('assetdet');
+	//protected $childtables=array();
 	/**
 	 * @var AssetLine[]     Array of subtable lines
 	 */
diff --git a/htdocs/bom/class/bom.class.php b/htdocs/bom/class/bom.class.php
index 99331de8c62..5d9f1f50cbc 100644
--- a/htdocs/bom/class/bom.class.php
+++ b/htdocs/bom/class/bom.class.php
@@ -41,12 +41,6 @@ class BOM extends CommonObject
 	 */
 	public $table_element = 'bom_bom';
 
-	/**
-	 * @var string Name of subtable if this object has sub lines
-	 */
-	public $table_element_line = 'bom_bomline';
-	public $fk_element = 'fk_bom';
-
 	/**
 	 * @var int  Does bom support multicompany module ? 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
 	 */
@@ -134,27 +128,32 @@ class BOM extends CommonObject
 	/**
 	 * @var int    Name of subtable line
 	 */
-	//public $table_element_line = 'bomdet';
+	public $table_element_line = 'bom_bomline';
 
 	/**
 	 * @var int    Field with ID of parent key if this field has a parent
 	 */
-	//public $fk_element = 'fk_bom';
+	public $fk_element = 'fk_bom';
 
 	/**
 	 * @var int    Name of subtable class that manage subtable lines
 	 */
-	//public $class_element_line = 'BillOfMaterialsline';
+	public $class_element_line = 'BOMLine';
 
 	/**
-	 * @var array  Array of child tables (child tables to delete before deleting a record)
+	 * @var array	List of child tables. To test if we can delete object.
 	 */
-	//protected $childtables=array('bomdet');
+	//protected $childtables=array();
 
 	/**
-	 * @var BillOfMaterialsLine[]     Array of subtable lines
+	 * @var array	List of child tables. To know object to delete on cascade.
 	 */
-	//public $lines = array();
+	protected $childtablesoncascade=array('bom_bomline');
+
+	/**
+	 * @var BOMLine[]     Array of subtable lines
+	 */
+	public $lines = array();
 
 
 
diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index f989f0bb431..9c5812069b7 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -7490,7 +7490,7 @@ abstract class CommonObject
 
 		$this->db->begin();
 
-		if ($forcechilddeletion)
+		if ($forcechilddeletion)	// Force also delete of childtables that should lock deletion in standard case when option force is off
 		{
 			foreach($this->childtables as $table)
 			{
@@ -7518,6 +7518,20 @@ abstract class CommonObject
 			}
 		}
 
+		// Delete cascade first
+		foreach($this->childtablesoncascade as $table)
+		{
+			$sql = 'DELETE FROM '.MAIN_DB_PREFIX.$table.' WHERE '.$this->fk_element.' = '.$this->id;
+			$resql = $this->db->query($sql);
+			if (! $resql)
+			{
+				$this->error=$this->db->lasterror();
+				$this->errors[]=$this->error;
+				$this->db->rollback();
+				return -1;
+			}
+		}
+
 		if (! $error) {
 			if (! $notrigger) {
 				// Call triggers
diff --git a/htdocs/core/class/coreobject.class.php b/htdocs/core/class/coreobject.class.php
index 02a083978ef..41aae05d74a 100644
--- a/htdocs/core/class/coreobject.class.php
+++ b/htdocs/core/class/coreobject.class.php
@@ -25,6 +25,7 @@
 
 require_once DOL_DOCUMENT_ROOT.'/core/class/commonobject.class.php';
 
+// TODO Remove this class (used in Expensereportik and ExpenseReportRule
 class CoreObject extends CommonObject
 {
     public $withChild = true;
@@ -175,7 +176,7 @@ class CoreObject extends CommonObject
      */
     public function fetchChild()
     {
-        if($this->withChild && !empty($this->childtables) && !empty($this->fk_element))
+        if ($this->withChild && !empty($this->childtables) && !empty($this->fk_element))
         {
             foreach($this->childtables as &$childTable)
             {
diff --git a/htdocs/core/class/emailsenderprofile.class.php b/htdocs/core/class/emailsenderprofile.class.php
index f9eeeabf4c6..c3d37d03b85 100644
--- a/htdocs/core/class/emailsenderprofile.class.php
+++ b/htdocs/core/class/emailsenderprofile.class.php
@@ -131,9 +131,9 @@ class EmailSenderProfile extends CommonObject
 	 */
 	//public $class_element_line = 'EmailSenderProfileline';
 	/**
-	 * @var array  Array of child tables (child tables to delete before deleting a record)
+	 * @var array	List of child tables. To test if we can delete object.
 	 */
-	//protected $childtables=array('emailsenderprofiledet');
+	//protected $childtables=array();
 	/**
 	 * @var EmailSenderProfileLine[]     Array of subtable lines
 	 */
diff --git a/htdocs/core/db/DoliDB.class.php b/htdocs/core/db/DoliDB.class.php
index b05f118b08b..3819e785f68 100644
--- a/htdocs/core/db/DoliDB.class.php
+++ b/htdocs/core/db/DoliDB.class.php
@@ -160,10 +160,10 @@ abstract class DoliDB implements Database
 	}
 
 	/**
-	 *	Annulation d'une transaction et retour aux anciennes valeurs
+	 *	Cancel a transaction and go back to initial data values
 	 *
 	 * 	@param	string			$log		Add more log to default log line
-	 * 	@return	resource|int         		1 si annulation ok ou transaction non ouverte, 0 en cas d'erreur
+	 * 	@return	resource|int         		1 if cancelation is ok or transaction not open, 0 if error
 	 */
     public function rollback($log = '')
 	{
diff --git a/htdocs/debugbar/class/DataCollector/DolQueryCollector.php b/htdocs/debugbar/class/DataCollector/DolQueryCollector.php
index 8430cf41adf..03811890f43 100644
--- a/htdocs/debugbar/class/DataCollector/DolQueryCollector.php
+++ b/htdocs/debugbar/class/DataCollector/DolQueryCollector.php
@@ -24,6 +24,7 @@ class DolQueryCollector extends DataCollector implements Renderable, AssetProvid
 	{
 		global $db;
 
+		// Replace $db handler with new handler override by TraceableDB
 		$db = new TraceableDB($db);
 
 		$this->db = $db;
diff --git a/htdocs/debugbar/class/TraceableDB.php b/htdocs/debugbar/class/TraceableDB.php
index 0caf6c2489f..4edc39a74af 100644
--- a/htdocs/debugbar/class/TraceableDB.php
+++ b/htdocs/debugbar/class/TraceableDB.php
@@ -7,7 +7,6 @@ require_once DOL_DOCUMENT_ROOT .'/core/db/DoliDB.class.php';
  *
  * Used to log queries into DebugBar
  */
-
 class TraceableDB extends DoliDB
 {
 	/**
@@ -275,10 +274,10 @@ class TraceableDB extends DoliDB
 	}
 
 	/**
-	 * Annulation d'une transaction et retour aux anciennes valeurs
+	 *	Cancel a transaction and go back to initial data values
 	 *
-	 * @param	string $log Add more log to default log line
-	 * @return  int                1 si annulation ok ou transaction non ouverte, 0 en cas d'erreur
+	 * 	@param	string			$log		Add more log to default log line
+	 * 	@return	resource|int         		1 if cancelation is ok or transaction not open, 0 if error
 	 */
 	public function rollback($log = '')
 	{
diff --git a/htdocs/emailcollector/class/emailcollector.class.php b/htdocs/emailcollector/class/emailcollector.class.php
index ff4be06fcab..b22d7b23607 100644
--- a/htdocs/emailcollector/class/emailcollector.class.php
+++ b/htdocs/emailcollector/class/emailcollector.class.php
@@ -62,9 +62,13 @@ class EmailCollector extends CommonObject
     public $fk_element = 'fk_emailcollector';
 
     /**
-     * @var array  Array of child tables (child tables to delete before deleting a record)
+	 * @var array	List of child tables. To test if we can delete object.
      */
-    protected $childtables=array('emailcollector_emailcollectorfilter', 'emailcollector_emailcollectoraction');
+    protected $childtables=array();
+    /**
+     * @var array	List of child tables. To know object to delete on cascade.
+     */
+    protected $childtablesoncascade=array('emailcollector_emailcollectorfilter','emailcollector_emailcollectoraction');
 
 
     /**
diff --git a/htdocs/emailcollector/class/emailcollectoraction.class.php b/htdocs/emailcollector/class/emailcollectoraction.class.php
index ca710f99216..96f650c9fc0 100644
--- a/htdocs/emailcollector/class/emailcollectoraction.class.php
+++ b/htdocs/emailcollector/class/emailcollectoraction.class.php
@@ -127,9 +127,9 @@ class EmailCollectorAction extends CommonObject
     //public $class_element_line = 'EmailcollectorActionline';
 
     // /**
-    //  * @var array  Array of child tables (child tables to delete before deleting a record)
+    //	* @var array	List of child tables. To test if we can delete object.
     //  */
-    //protected $childtables=array('emailcollectoractiondet');
+    //protected $childtables=array();
 
     // /**
     //  * @var EmailcollectorActionLine[]     Array of subtable lines
diff --git a/htdocs/modulebuilder/template/class/myobject.class.php b/htdocs/modulebuilder/template/class/myobject.class.php
index 1b4d1c7b52d..0025c00165d 100644
--- a/htdocs/modulebuilder/template/class/myobject.class.php
+++ b/htdocs/modulebuilder/template/class/myobject.class.php
@@ -42,12 +42,6 @@ class MyObject extends CommonObject
 	 */
 	public $table_element = 'mymodule_myobject';
 
-	/**
-	 * @var string Name of subtable if this object has sub lines
-	 */
-	//public $table_element_line = 'mymodule_myobjectline';
-	//public $fk_element = 'fk_myobject';
-
 	/**
 	 * @var int  Does myobject support multicompany module ? 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
 	 */
@@ -171,13 +165,12 @@ class MyObject extends CommonObject
 	// END MODULEBUILDER PROPERTIES
 
 
-
 	// If this object has a subtable with lines
 
 	/**
 	 * @var int    Name of subtable line
 	 */
-	//public $table_element_line = 'myobjectdet';
+	//public $table_element_line = 'mymodule_myobjectline';
 
 	/**
 	 * @var int    Field with ID of parent key if this field has a parent
@@ -190,9 +183,14 @@ class MyObject extends CommonObject
 	//public $class_element_line = 'MyObjectline';
 
 	/**
-	 * @var array  Array of child tables (child tables to delete before deleting a record)
+	 * @var array	List of child tables. To test if we can delete object.
 	 */
-	//protected $childtables=array('myobjectdet');
+	//protected $childtables=array();
+
+	/**
+	 * @var array	List of child tables. To know object to delete on cascade.
+	 */
+	//protected $childtablesoncascade=array('mymodule_myobjectdet');
 
 	/**
 	 * @var MyObjectLine[]     Array of subtable lines
diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index a5491045c16..02de9b4d47d 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -59,7 +59,10 @@ class Product extends CommonObject
      */
     public $fk_element='fk_product';
 
-    protected $childtables=array('supplier_proposaldet', 'propaldet','commandedet','facturedet','contratdet','facture_fourn_det','commande_fournisseurdet');    // To test if we can delete object
+    /**
+     * @var array	List of child tables. To test if we can delete object.
+     */
+    protected $childtables=array('supplier_proposaldet', 'propaldet', 'commandedet', 'facturedet', 'contratdet', 'facture_fourn_det', 'commande_fournisseurdet');
 
     /**
      * 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
diff --git a/htdocs/product/inventory/class/inventory.class.php b/htdocs/product/inventory/class/inventory.class.php
index 7f535a2eac0..62cfc476ba8 100644
--- a/htdocs/product/inventory/class/inventory.class.php
+++ b/htdocs/product/inventory/class/inventory.class.php
@@ -169,9 +169,13 @@ class Inventory extends CommonObject
 	public $class_element_line = 'Inventoryline';
 
 	/**
-	 * @var array  Array of child tables (child tables to delete before deleting a record)
+	 * @var array	List of child tables. To test if we can delete object.
 	 */
-	protected $childtables=array('inventorydet');
+	protected $childtables=array();
+	/**
+	 * @var array	List of child tables. To know object to delete on cascade.
+	 */
+	protected $childtablesoncascade=array('inventorydet');
 
 	/**
 	 * @var InventoryLine[]     Array of subtable lines
diff --git a/htdocs/projet/class/task.class.php b/htdocs/projet/class/task.class.php
index a5f63e32826..ce4779e1a6d 100644
--- a/htdocs/projet/class/task.class.php
+++ b/htdocs/projet/class/task.class.php
@@ -48,7 +48,11 @@ class Task extends CommonObject
 	public $fk_element='fk_task';
 
 	public $picto = 'task';
-	protected $childtables=array('projet_task_time');    // To test if we can delete object
+
+	/**
+	 * @var array	List of child tables. To test if we can delete object.
+	 */
+	protected $childtables=array('projet_task_time');
 
 	/**
      * @var int ID parent task
diff --git a/htdocs/societe/class/companypaymentmode.class.php b/htdocs/societe/class/companypaymentmode.class.php
index e3e86e2cf4a..4275d356566 100644
--- a/htdocs/societe/class/companypaymentmode.class.php
+++ b/htdocs/societe/class/companypaymentmode.class.php
@@ -204,9 +204,9 @@ class CompanyPaymentMode extends CommonObject
 	 */
 	//public $class_element_line = 'CompanyPaymentModeline';
 	/**
-	 * @var array  Array of child tables (child tables to delete before deleting a record)
+     * @var array	List of child tables. To test if we can delete object.
 	 */
-	//protected $childtables=array('companypaymentmodedet');
+	//protected $childtables=array();
 	/**
 	 * @var CompanyPaymentModeLine[]     Array of subtable lines
 	 */
diff --git a/htdocs/societe/class/societe.class.php b/htdocs/societe/class/societe.class.php
index 5ded310683b..5187d8522a2 100644
--- a/htdocs/societe/class/societe.class.php
+++ b/htdocs/societe/class/societe.class.php
@@ -59,8 +59,16 @@ class Societe extends CommonObject
 	public $fk_element='fk_soc';
 
 	public $fieldsforcombobox='nom,name_alias';
-	protected $childtables=array("supplier_proposal"=>'SupplierProposal',"propal"=>'Proposal',"commande"=>'Order',"facture"=>'Invoice',"facture_rec"=>'RecurringInvoiceTemplate',"contrat"=>'Contract',"fichinter"=>'Fichinter',"facture_fourn"=>'SupplierInvoice',"commande_fournisseur"=>'SupplierOrder',"projet"=>'Project',"expedition"=>'Shipment',"prelevement_lignes"=>'DirectDebitRecord');    // To test if we can delete object
+
+	/**
+	 * @var array	List of child tables. To test if we can delete object.
+	 */
+	protected $childtables=array("supplier_proposal"=>'SupplierProposal',"propal"=>'Proposal',"commande"=>'Order',"facture"=>'Invoice',"facture_rec"=>'RecurringInvoiceTemplate',"contrat"=>'Contract',"fichinter"=>'Fichinter',"facture_fourn"=>'SupplierInvoice',"commande_fournisseur"=>'SupplierOrder',"projet"=>'Project',"expedition"=>'Shipment',"prelevement_lignes"=>'DirectDebitRecord');
+	/**
+	 * @var array	List of child tables. To know object to delete on cascade.
+	 */
 	protected $childtablesoncascade=array("societe_prices", "societe_log", "societe_address", "product_fournisseur_price", "product_customer_price_log", "product_customer_price", "socpeople", "adherent", "societe_account", "societe_rib", "societe_remise", "societe_remise_except", "societe_commerciaux", "categorie", "notify", "notify_def", "actioncomm");
+
 	public $picto = 'company';
 
 	/**
diff --git a/htdocs/societe/class/societeaccount.class.php b/htdocs/societe/class/societeaccount.class.php
index a82ad69091b..5f333da69a3 100644
--- a/htdocs/societe/class/societeaccount.class.php
+++ b/htdocs/societe/class/societeaccount.class.php
@@ -164,9 +164,9 @@ class SocieteAccount extends CommonObject
 	 */
 	//public $class_element_line = 'societeAccountline';
 	/**
-	 * @var array  Array of child tables (child tables to delete before deleting a record)
+     * @var array	List of child tables. To test if we can delete object.
 	 */
-	//protected $childtables=array('societe_accountdet');
+	//protected $childtables=array();
 	/**
 	 * @var societeAccountLine[]     Array of subtable lines
 	 */