diff --git a/htdocs/comm/propal/card.php b/htdocs/comm/propal/card.php
index 70c6ab38ceb..4c3728e4a00 100644
--- a/htdocs/comm/propal/card.php
+++ b/htdocs/comm/propal/card.php
@@ -914,6 +914,37 @@ if (empty($reshook)) {
 		foreach ($object->lines as $line) {
 			$result = $object->updateline($line->id, $line->subprice, $line->qty, $remise_percent, $line->tva_tx, $line->localtax1_tx, $line->localtax2_tx, $line->desc, 'HT', $line->info_bits, $line->special_code, $line->fk_parent_line, 0, $line->fk_fournprice, $line->pa_ht, $line->label, $line->product_type, $line->date_start, $line->date_end, $line->array_options, $line->fk_unit, $line->multicurrency_subprice);
 		}
+	} elseif ($action == 'addline' && GETPOST('submitforallmargins', 'alpha') && GETPOST('marginforalllines') !== '' && $usercancreate) {
+		// Define margin
+		$margin_rate = (GETPOST('marginforalllines') ? GETPOST('marginforalllines') : 0);
+		foreach ($object->lines as &$line) {
+			$subprice = price2num($line->pa_ht * (1 + $margin_rate/100), 'MU');
+			$prod = new Product($db);
+			$prod->fetch($line->fk_product);
+			if ($prod->price_min > $subprice) {
+				$price_subprice  = price($subprice,        0, $outlangs, 1, -1, -1, 'auto');
+				$price_price_min = price($prod->price_min, 0, $outlangs, 1, -1, -1, 'auto');
+				setEventMessages($prod->ref.' - '.$prod->label.' ('.$price_subprice.' < '.$price_price_min.' '.strtolower($langs->trans("MinPrice")).')'."\n", null, 'warnings');
+			}
+			// Manage $line->subprice and $line->multicurrency_subprice
+			$multicurrency_subprice = $subprice * $line->multicurrency_subprice / $line->subprice;
+			// Update DB
+			$result = $object->updateline($line->id, $subprice, $line->qty, $line->remise_percent, $line->tva_tx, $line->localtax1_rate, $line->localtax2_rate, $line->desc, 'HT', $line->info_bits, $line->special_code, $line->fk_parent_line, 0, $line->fk_fournprice, $line->pa_ht, $line->label, $line->product_type, $line->date_start, $line->date_end, $line->array_options, $line->fk_unit, $multicurrency_subprice);
+			// Update $object with new margin info
+			$line->price = $subprice;
+			$line->marge_tx = $margin_rate;
+			$line->marque_tx = $margin_rate * $line->pa_ht / $subprice;
+			$line->total_ht = $line->qty * $subprice;
+			$line->total_tva = $line->tva_tx * $line->qty * $subprice;
+			$line->total_ttc = (1 + $line->tva_tx) * $line->qty * $subprice;
+			// Manage $line->subprice and $line->multicurrency_subprice
+			$line->multicurrency_total_ht = $line->qty * $subprice * $line->multicurrency_subprice / $line->subprice;
+			$line->multicurrency_total_tva = $line->tva_tx * $line->qty * $subprice * $line->multicurrency_subprice / $line->subprice;
+			$line->multicurrency_total_ttc = (1 + $line->tva_tx) * $line->qty * $subprice * $line->multicurrency_subprice / $line->subprice;
+			// Used previous $line->subprice and $line->multicurrency_subprice above, now they can be set to their new values
+			$line->subprice = $subprice;
+			$line->multicurrency_subprice = $multicurrency_subprice;
+		}
 	} elseif ($action == 'addline' && $usercancreate) {		// Add line
 		// Set if we used free entry or predefined product
 		$predef = '';
diff --git a/htdocs/core/tpl/objectline_title.tpl.php b/htdocs/core/tpl/objectline_title.tpl.php
index 4640d710705..24231d3fe68 100644
--- a/htdocs/core/tpl/objectline_title.tpl.php
+++ b/htdocs/core/tpl/objectline_title.tpl.php
@@ -141,7 +141,17 @@ if ($usemargins && isModEnabled('margin') && empty($user->socid)) {
 	}
 
 	if (!empty($conf->global->DISPLAY_MARGIN_RATES) && $user->rights->margins->liretous) {
-		print '<th class="linecolmargin2 margininfos right" style="width: 50px">'.$langs->trans('MarginRate').'</th>';
+		print '<th class="linecolmargin2 margininfos right" style="width: 50px">'.$langs->trans('MarginRate');
+		if ($user->hasRight("propal", "creer")) {
+			print '<a class="reposition" href="'.$_SERVER["PHP_SELF"].'?mode=marginforalllines&id='.$object->id.'">'.img_edit($langs->trans("UpdateForAllLines"), 0, 'class="clickmarginforalllines opacitymedium paddingleft cursorpointer"').'</a>';
+			if (GETPOST('mode', 'aZ09') == 'marginforalllines') {
+				print '<div class="classmarginforalllines inline-block nowraponall">';
+				print '<input type="number" name="marginforalllines" min="0" max="999.9" value="20.0" step="0.1"><label>%</label>';
+				print '<input class="inline-block button smallpaddingimp" type="submit" name="submitforallmargins" value="'.$langs->trans("Update").'">';
+				print '</div>';
+			}
+		}
+		print '</th>';
 	}
 	if (!empty($conf->global->DISPLAY_MARK_RATES) && $user->rights->margins->liretous) {
 		print '<th class="linecolmargin2 margininfos right" style="width: 50px">'.$langs->trans('MarkRate').'</th>';
diff --git a/htdocs/langs/en_US/margins.lang b/htdocs/langs/en_US/margins.lang
index a91b139ec7b..9101966eff2 100644
--- a/htdocs/langs/en_US/margins.lang
+++ b/htdocs/langs/en_US/margins.lang
@@ -6,6 +6,7 @@ TotalMargin=Total Margin
 MarginOnProducts=Margin / Products
 MarginOnServices=Margin / Services
 MarginRate=Margin rate
+ModifyMarginRates=Modify margin rates
 MarkRate=Mark rate
 DisplayMarginRates=Display margin rates
 DisplayMarkRates=Display mark rates
diff --git a/htdocs/langs/fr_FR/margins.lang b/htdocs/langs/fr_FR/margins.lang
index a8a68c6599f..742b8ce76c0 100644
--- a/htdocs/langs/fr_FR/margins.lang
+++ b/htdocs/langs/fr_FR/margins.lang
@@ -8,6 +8,7 @@ MarginOnServices=Marge / Services
 MarginRate=Taux de marge
 MarkRate=Taux de marque
 DisplayMarginRates=Afficher les taux de marge
+ModifyMarginRates=Modifier les taux de marge
 DisplayMarkRates=Afficher les taux de marque
 InputPrice=Saisir un prix
 margin=Gestion des marges