diff --git a/htdocs/comm/propal/card.php b/htdocs/comm/propal/card.php
index f42b82718e6..2c6b7a9dca6 100644
--- a/htdocs/comm/propal/card.php
+++ b/htdocs/comm/propal/card.php
@@ -825,7 +825,7 @@ if (empty($reshook))
 			$error++;
 		}
 
-		if ($prod_entry_mode == 'free' && empty($idprod) && $price_ht == '' && $price_ht_devise == '') 	// Unit price can be 0 but not ''. Also price can be negative for proposal.
+		if ($prod_entry_mode == 'free' && empty($idprod) && $price_ht === '' && $price_ht_devise === '') 	// Unit price can be 0 but not ''. Also price can be negative for proposal.
 		{
 			setEventMessages($langs->trans("ErrorFieldRequired", $langs->transnoentitiesnoconv("UnitPriceHT")), null, 'errors');
 			$error++;
@@ -966,7 +966,7 @@ if (empty($reshook))
 				$tmpprodvat = price2num(preg_replace('/\s*\(.*\)/', '', $prod->tva_tx));
 
 				// if price ht is forced (ie: calculated by margin rate and cost price). TODO Why this ?
-				if (!empty($price_ht)) {
+				if (!empty($price_ht) || $price_ht === '0') {
 					$pu_ht = price2num($price_ht, 'MU');
 					$pu_ttc = price2num($pu_ht * (1 + ($tmpvat / 100)), 'MU');
 				} // On reevalue prix selon taux tva car taux tva transaction peut etre different
diff --git a/htdocs/commande/card.php b/htdocs/commande/card.php
index b447a00c404..b3cb465d70d 100644
--- a/htdocs/commande/card.php
+++ b/htdocs/commande/card.php
@@ -820,7 +820,7 @@ if (empty($reshook))
 				$tmpprodvat = price2num(preg_replace('/\s*\(.*\)/', '', $prod->tva_tx));
 
 				// if price ht is forced (ie: calculated by margin rate and cost price). TODO Why this ?
-				if (!empty($price_ht)) {
+				if (!empty($price_ht) || $price_ht === '0') {
 					$pu_ht = price2num($price_ht, 'MU');
 					$pu_ttc = price2num($pu_ht * (1 + ($tmpvat / 100)), 'MU');
 				}
diff --git a/htdocs/compta/facture/card.php b/htdocs/compta/facture/card.php
index 87a3a3c8be2..634a4a0e452 100644
--- a/htdocs/compta/facture/card.php
+++ b/htdocs/compta/facture/card.php
@@ -2012,7 +2012,7 @@ if (empty($reshook))
 				$tmpprodvat = price2num(preg_replace('/\s*\(.*\)/', '', $prod->tva_tx));
 
 				// if price ht was forced (ie: from gui when calculated by margin rate and cost price). TODO Why this ?
-				if (!empty($price_ht))
+				if (!empty($price_ht) || $price_ht === '0')
 				{
 					$pu_ht = price2num($price_ht, 'MU');
 					$pu_ttc = price2num($pu_ht * (1 + ($tmpvat / 100)), 'MU');
diff --git a/htdocs/contact/agenda.php b/htdocs/contact/agenda.php
index 7ac512bd32f..23a6042fbf9 100644
--- a/htdocs/contact/agenda.php
+++ b/htdocs/contact/agenda.php
@@ -240,18 +240,11 @@ if (is_object($objcanvas) && $objcanvas->displayCanvasExists($action))
         $permok = $user->rights->agenda->myactions->create;
         if ((!empty($objthirdparty->id) || !empty($objcon->id)) && $permok)
         {
-            //$out.='<a href="'.DOL_URL_ROOT.'/comm/action/card.php?action=create';
-            if (is_object($objthirdparty) && get_class($objthirdparty) == 'Societe') $out .= '&amp;socid='.$objthirdparty->id;
-            $out .= (!empty($objcon->id) ? '&amp;contactid='.$objcon->id : '').'&amp;backtopage=1&amp;percentage=-1';
-        	//$out.=$langs->trans("AddAnAction").' ';
-        	//$out.=img_picto($langs->trans("AddAnAction"),'filenew');
-        	//$out.="</a>";
+			if (is_object($objthirdparty) && get_class($objthirdparty) == 'Societe') $out .= '&amp;originid='.$objthirdparty->id.($objthirdparty->id > 0 ? '&amp;socid='.$objthirdparty->id : '');
+			$out .= (!empty($objcon->id) ? '&amp;contactid='.$objcon->id : '').'&amp;origin=contact&amp;originid='.$object->id.'&amp;percentage=-1&amp;backtopage='.urlencode($_SERVER['PHP_SELF'].($objcon->id > 0 ? '?id='.$objcon->id : ''));
+			$out .= '&amp;datep='.urlencode(dol_print_date(dol_now(), 'dayhourlog'));
     	}
 
-
-    	//print '<div class="tabsAction">';
-        //print '</div>';
-
     	$newcardbutton = '';
     	if (!empty($conf->agenda->enabled))
     	{
diff --git a/htdocs/core/class/html.formactions.class.php b/htdocs/core/class/html.formactions.class.php
index 8614d4ee433..54406b1075b 100644
--- a/htdocs/core/class/html.formactions.class.php
+++ b/htdocs/core/class/html.formactions.class.php
@@ -202,7 +202,7 @@ class FormActions
 			$newcardbutton = '';
 			if (!empty($conf->agenda->enabled) && !empty($user->rights->agenda->myactions->create))
 			{
-				$newcardbutton .= dolGetButtonTitle($langs->trans("AddEvent"), '', 'fa fa-plus-circle', DOL_URL_ROOT.'/comm/action/card.php?action=create&datep='.dol_print_date(dol_now(), 'dayhourlog').'&origin='.$typeelement.'&originid='.$object->id.($object->socid > 0 ? '&socid='.$object->socid : ($socid > 0 ? '&socid='.$socid : '')).($projectid > 0 ? '&projectid='.$projectid : '').'&backtopage='.urlencode($urlbacktopage));
+				$newcardbutton .= dolGetButtonTitle($langs->trans("AddEvent"), '', 'fa fa-plus-circle', DOL_URL_ROOT.'/comm/action/card.php?action=create&amp;datep='.urlencode(dol_print_date(dol_now(), 'dayhourlog')).'&amp;origin='.urlencode($typeelement).'&amp;originid='.$object->id.($object->socid > 0 ? '&amp;socid='.$object->socid : ($socid > 0 ? '&amp;socid='.$socid : '')).($projectid > 0 ? '&amp;projectid='.$projectid : '').'&amp;backtopage='.urlencode($urlbacktopage));
 			}
 
 
diff --git a/htdocs/societe/agenda.php b/htdocs/societe/agenda.php
index 61d473f5c43..77953f73d7c 100644
--- a/htdocs/societe/agenda.php
+++ b/htdocs/societe/agenda.php
@@ -139,19 +139,11 @@ if ($socid > 0)
     $permok = $user->rights->agenda->myactions->create;
     if ((!empty($objthirdparty->id) || !empty($objcon->id)) && $permok)
     {
-        //$out.='<a href="'.DOL_URL_ROOT.'/comm/action/card.php?action=create';
-        if (get_class($objthirdparty) == 'Societe') $out .= '&amp;socid='.$objthirdparty->id;
-        $out .= (!empty($objcon->id) ? '&amp;contactid='.$objcon->id : '').'&amp;backtopage=1&amp;percentage=-1';
-    	//$out.=$langs->trans("AddAnAction").' ';
-    	//$out.=img_picto($langs->trans("AddAnAction"),'filenew');
-    	//$out.="</a>";
+		if (is_object($objthirdparty) && get_class($objthirdparty) == 'Societe') $out .= '&amp;originid='.$objthirdparty->id.($objthirdparty->id > 0 ? '&amp;socid='.$objthirdparty->id : '').'&amp;backtopage='.urlencode($_SERVER['PHP_SELF'].($objthirdparty->id > 0 ? '?socid='.$objthirdparty->id : ''));
+		$out .= (!empty($objcon->id) ? '&amp;contactid='.$objcon->id : '').'&amp;percentage=-1';
+		$out .= '&amp;datep='.dol_print_date(dol_now(), 'dayhourlog');
 	}
 
-
-	//print '<div class="tabsAction">';
-	//print '</div>';
-
-
 	$newcardbutton = '';
     if (!empty($conf->agenda->enabled))
     {