diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index e80b4939baf..beeb60394c3 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -1197,7 +1197,9 @@ function pdf_getlinenum($object,$i,$outputlangs,$hidedetails=0)
 	{
 		$special_code = $object->lines[$i]->special_code;
 		if (! empty($object->lines[$i]->fk_parent_line)) $special_code = $object->getSpecialCode($object->lines[$i]->fk_parent_line);
-		// TODO add hook function
+		$parameters = array('i'=>$i,'outputlangs'=>$outputlangs,'hidedetails'=>$hidedetails,'special_code'=>$special_code);
+		$action='';
+		return $hookmanager->executeHooks('pdf_getlinenum',$parameters,$object,$action);    // Note that $action and $object may have been modified by some hooks
 	}
 	else
 	{
@@ -1223,7 +1225,9 @@ function pdf_getlineref($object,$i,$outputlangs,$hidedetails=0)
 	{
 		$special_code = $object->lines[$i]->special_code;
 		if (! empty($object->lines[$i]->fk_parent_line)) $special_code = $object->getSpecialCode($object->lines[$i]->fk_parent_line);
-		// TODO add hook function
+		$parameters = array('i'=>$i,'outputlangs'=>$outputlangs,'hidedetails'=>$hidedetails,'special_code'=>$special_code);
+		$action='';
+		return $hookmanager->executeHooks('pdf_getlineref',$parameters,$object,$action);    // Note that $action and $object may have been modified by some hooks
 	}
 	else
 	{
@@ -1248,7 +1252,9 @@ function pdf_getlineref_supplier($object,$i,$outputlangs,$hidedetails=0)
 	{
 		$special_code = $object->lines[$i]->special_code;
 		if (! empty($object->lines[$i]->fk_parent_line)) $special_code = $object->getSpecialCode($object->lines[$i]->fk_parent_line);
-		// TODO add hook function
+		$parameters = array('i'=>$i,'outputlangs'=>$outputlangs,'hidedetails'=>$hidedetails,'special_code'=>$special_code);
+		$action='';
+		return $hookmanager->executeHooks('pdf_getlineref_supplier',$parameters,$object,$action);    // Note that $action and $object may have been modified by some hooks
 	}
 	else
 	{
@@ -1330,10 +1336,9 @@ function pdf_getlineupwithtax($object,$i,$outputlangs,$hidedetails=0)
 	{
 		$special_code = $object->lines[$i]->special_code;
 		if (! empty($object->lines[$i]->fk_parent_line)) $special_code = $object->getSpecialCode($object->lines[$i]->fk_parent_line);
-		foreach($object->hooks as $modules)
-		{
-			if (method_exists($modules[$special_code],'pdf_getlineupwithtax')) return $modules[$special_code]->pdf_getlineupwithtax($object,$i,$outputlangs,$hidedetails);
-		}
+		$parameters = array('i'=>$i,'outputlangs'=>$outputlangs,'hidedetails'=>$hidedetails,'special_code'=>$special_code);
+		$action='';
+		return $hookmanager->executeHooks('pdf_getlineupwithtax',$parameters,$object,$action);    // Note that $action and $object may have been modified by some hooks
 	}
 	else
 	{
@@ -1487,8 +1492,7 @@ function pdf_getlineunit($object, $i, $outputlangs, $hidedetails = 0, $hookmanag
 				'special_code' => $special_code
 			);
 			$action = '';
-			return $hookmanager->executeHooks('pdf_getlineunit', $parameters, $object,
-				$action);    // Note that $action and $object may have been modified by some hooks
+			return $hookmanager->executeHooks('pdf_getlineunit', $parameters, $object, $action);    // Note that $action and $object may have been modified by some hooks
 		} else {
 			if (empty($hidedetails) || $hidedetails > 1) {
 				return $langs->transnoentitiesnoconv($object->lines[$i]->getLabelOfUnit('short'));
@@ -1656,7 +1660,9 @@ function pdf_getTotalQty($object,$type,$outputlangs)
 			{
 				$special_code = $object->lines[$i]->special_code;
 				if (! empty($object->lines[$i]->fk_parent_line)) $special_code = $object->getSpecialCode($object->lines[$i]->fk_parent_line);
-				// TODO add hook function
+				$parameters = array('i'=>$i,'outputlangs'=>$outputlangs,'hidedetails'=>$hidedetails,'special_code'=>$special_code);
+				$action='';
+				return $hookmanager->executeHooks('pdf_getTotalQty',$parameters,$object,$action);    // Note that $action and $object may have been modified by some hooks
 			}
 			else if ($type==0 && $object->lines[$i]->product_type == 0)
 			{
@@ -1692,7 +1698,7 @@ function pdf_getLinkedObjects($object,$outputlangs)
 		if ($objecttype == 'propal')
 		{
 			$outputlangs->load('propal');
-			
+
 			foreach($objects as $elementobject)
 			{
 				$linkedobjects[$objecttype]['ref_title'] = $outputlangs->transnoentities("RefProposal");