diff --git a/htdocs/accountancy/class/accountingjournal.class.php b/htdocs/accountancy/class/accountingjournal.class.php
index 32a0ea0f448..b062b9495b9 100644
--- a/htdocs/accountancy/class/accountingjournal.class.php
+++ b/htdocs/accountancy/class/accountingjournal.class.php
@@ -36,7 +36,11 @@ class AccountingJournal extends CommonObject
 	 */
 	public $table_element='accounting_journal';
 
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
 	public $fk_element = '';
+
 	public $ismultientitymanaged = 0;	// 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
 	public $picto = 'generic';
 
diff --git a/htdocs/comm/propal/class/propal.class.php b/htdocs/comm/propal/class/propal.class.php
index 6e14b14ea48..bac7cbfcf36 100644
--- a/htdocs/comm/propal/class/propal.class.php
+++ b/htdocs/comm/propal/class/propal.class.php
@@ -56,7 +56,12 @@ class Propal extends CommonObject
 	public $table_element='propal';
 
 	public $table_element_line='propaldet';
-	public $fk_element='fk_propal';
+
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
+	public $fk_element ='fk_propal';
+
 	public $picto='propal';
 
 	/**
diff --git a/htdocs/commande/class/commande.class.php b/htdocs/commande/class/commande.class.php
index 8426a714e58..5e0475b158a 100644
--- a/htdocs/commande/class/commande.class.php
+++ b/htdocs/commande/class/commande.class.php
@@ -54,7 +54,12 @@ class Commande extends CommonOrder
 
 	public $table_element_line = 'commandedet';
 	public $class_element_line = 'OrderLine';
+
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
 	public $fk_element = 'fk_commande';
+
 	public $picto = 'order';
 	/**
 	 * 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
diff --git a/htdocs/compta/deplacement/class/deplacement.class.php b/htdocs/compta/deplacement/class/deplacement.class.php
index 71ca92093a7..c6c95a0e282 100644
--- a/htdocs/compta/deplacement/class/deplacement.class.php
+++ b/htdocs/compta/deplacement/class/deplacement.class.php
@@ -42,7 +42,12 @@ class Deplacement extends CommonObject
 	public $table_element='deplacement';
 
 	public $table_element_line = '';
+
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
 	public $fk_element = '';
+
 	public $ismultientitymanaged = 0;	// 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
 
 	var $datec;         // Creation date
diff --git a/htdocs/compta/facture/class/facture-rec.class.php b/htdocs/compta/facture/class/facture-rec.class.php
index b6be8315897..7d054d054da 100644
--- a/htdocs/compta/facture/class/facture-rec.class.php
+++ b/htdocs/compta/facture/class/facture-rec.class.php
@@ -43,14 +43,19 @@ class FactureRec extends CommonInvoice
 	 * @var string ID to identify managed object
 	 */
 	public $element='facturerec';
-	
+
 	/**
 	 * @var string Name of table without prefix where object is stored
 	 */
 	public $table_element='facture_rec';
-	
+
 	public $table_element_line='facturedet_rec';
+
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
 	public $fk_element='fk_facture';
+
 	public $picto='bill';
 
 	var $entity;
@@ -1651,7 +1656,7 @@ class FactureLigneRec extends CommonInvoiceLine
 	 * @var string ID to identify managed object
 	 */
 	public $element='facturedetrec';
-	
+
 	/**
 	 * @var string Name of table without prefix where object is stored
 	 */
diff --git a/htdocs/compta/facture/class/facture.class.php b/htdocs/compta/facture/class/facture.class.php
index 7b743ad0b36..0b77f7c5c07 100644
--- a/htdocs/compta/facture/class/facture.class.php
+++ b/htdocs/compta/facture/class/facture.class.php
@@ -57,14 +57,19 @@ class Facture extends CommonInvoice
 	 * @var string ID to identify managed object
 	 */
 	public $element='facture';
-	
+
 	/**
 	 * @var string Name of table without prefix where object is stored
 	 */
 	public $table_element='facture';
-	
+
 	public $table_element_line = 'facturedet';
+
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
 	public $fk_element = 'fk_facture';
+
 	public $picto='bill';
 	/**
 	 * 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
@@ -4242,7 +4247,7 @@ class FactureLigne extends CommonInvoiceLine
 	 * @var string ID to identify managed object
 	 */
 	public $element='facturedet';
-    
+
     /**
 	 * @var string Name of table without prefix where object is stored
 	 */
diff --git a/htdocs/contrat/class/contrat.class.php b/htdocs/contrat/class/contrat.class.php
index 8c89ffa810f..4f153cf33d7 100644
--- a/htdocs/contrat/class/contrat.class.php
+++ b/htdocs/contrat/class/contrat.class.php
@@ -52,7 +52,12 @@ class Contrat extends CommonObject
 	public $table_element='contrat';
 
 	public $table_element_line='contratdet';
+
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
 	public $fk_element='fk_contrat';
+
     public $picto='contract';
 
     /**
diff --git a/htdocs/core/class/comment.class.php b/htdocs/core/class/comment.class.php
index 33e727dcfd0..b75b4050788 100644
--- a/htdocs/core/class/comment.class.php
+++ b/htdocs/core/class/comment.class.php
@@ -31,7 +31,11 @@ class Comment extends CommonObject
 	 */
 	public $table_element='comment';
 
-	public $fk_element;
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
+	public $fk_element ='';
+
 	public $element_type;
 
 	/**
diff --git a/htdocs/core/class/fiscalyear.class.php b/htdocs/core/class/fiscalyear.class.php
index 72a5ad644e4..ad8c98d43c8 100644
--- a/htdocs/core/class/fiscalyear.class.php
+++ b/htdocs/core/class/fiscalyear.class.php
@@ -39,24 +39,29 @@ class Fiscalyear extends CommonObject
 	public $table_element='accounting_fiscalyear';
 
 	public $table_element_line = '';
+
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
 	public $fk_element = '';
+
 	public $ismultientitymanaged = 1;	// 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
 
-	var $rowid;
+	public $rowid;
 
 	/**
      * @var string fiscal year label
      */
     public $label;
 
-	var $date_start;
-	var $date_end;
-	var $datec;
-	var $statut;		// 0=open, 1=closed
-	var $entity;
+	public $date_start;
+	public $date_end;
+	public $datec;
+	public $statut;		// 0=open, 1=closed
+	public $entity;
 
-	var $statuts=array();
-	var $statuts_short=array();
+	public $statuts=array();
+	public $statuts_short=array();
 
 	/**
 	 * Constructor
diff --git a/htdocs/don/class/don.class.php b/htdocs/don/class/don.class.php
index de24f60a9c0..85d0fb81b8c 100644
--- a/htdocs/don/class/don.class.php
+++ b/htdocs/don/class/don.class.php
@@ -38,38 +38,42 @@ class Don extends CommonObject
 	 * @var string ID to identify managed object
 	 */
 	public $element='don';
-    
+
     /**
 	 * @var string Name of table without prefix where object is stored
 	 */
 	public $table_element='don';
-	
+
+	/**
+	 * @var int Field with ID of parent key if this field has a parent
+	 */
 	public $fk_element = 'fk_donation';
+
 	public $ismultientitymanaged = 1;  	// 0=No test on entity, 1=Test with field entity, 2=Test with link by societe
-    var $picto = 'generic';
+    public $picto = 'generic';
 
-    var $date;
-    var $amount;
-    var $societe;
-    var $address;
-    var $zip;
-    var $town;
-    var $email;
-    var $public;
-    var $fk_project;
-    var $fk_typepayment;
-	var $num_payment;
-	var $date_valid;
-	var $modepaymentid = 0;
+    public $date;
+    public $amount;
+    public $societe;
+    public $address;
+    public $zip;
+    public $town;
+    public $email;
+    public $public;
+    public $fk_project;
+    public $fk_typepayment;
+	public $num_payment;
+	public $date_valid;
+	public $modepaymentid = 0;
 
-	var $labelstatut;
-	var $labelstatutshort;
+	public $labelstatut;
+	public $labelstatutshort;
 
 	/**
 	 * @deprecated
 	 * @see note_private, note_public
 	 */
-	var $commentaire;
+	public $commentaire;
 
 
     /**