diff --git a/htdocs/mrp/mo_card.php b/htdocs/mrp/mo_card.php
index ecc30ab68a5..75164a24bff 100644
--- a/htdocs/mrp/mo_card.php
+++ b/htdocs/mrp/mo_card.php
@@ -268,6 +268,46 @@ if (empty($reshook)) {
 	}
 
 
+	// Allow editing qty while MO is still in draft status.
+	// IMPORTANT: this handler MUST run BEFORE actions_addupdatedelete.inc.php,
+	// which has a generic 'set<key>' matcher that would intercept 'setqty' and
+	// call $object->fetch() + update() without setting $object->oldQty, so
+	// Mo::updateProduction() would skip the line scaling (its condition is
+	// !empty($this->oldQty)).
+	if ($action == 'setqty' && $permissiontoadd && $object->status == Mo::STATUS_DRAFT) {
+		$newqty = GETPOSTFLOAT('qty');
+		if ($newqty > 0) {
+			$object->oldQty = (float) $object->qty;
+			$object->qty = $newqty;
+			$res = $object->update($user);
+			if ($res > 0) {
+				// Enforce invariant: the 'toproduce' line for the MO's main product
+				// must equal the MO qty. Mo::updateProduction() scales by ratio
+				// (newQty/oldQty) which can drift if the line state was already
+				// inconsistent (e.g. legacy data from before this patch). Realign
+				// the main product line, leaving sub-products and frozen lines
+				// untouched.
+				$object->fetchLines();
+				foreach ($object->lines as $line) {
+					if ($line->role === 'toproduce'
+						&& (int) $line->fk_product === (int) $object->fk_product
+						&& empty($line->qty_frozen)
+						&& (float) $line->qty != (float) $object->qty) {
+						$line->qty = (float) $object->qty;
+						$line->update($user);
+					}
+				}
+				setEventMessages($langs->trans("RecordSaved"), null, 'mesgs');
+			} else {
+				setEventMessages($object->error, $object->errors, 'errors');
+			}
+		} else {
+			setEventMessages($langs->trans("ErrorFieldRequired", $langs->trans("Qty")), null, 'errors');
+		}
+		header("Location: ".$_SERVER["PHP_SELF"]."?id=".$object->id);
+		exit;
+	}
+
 	// Actions cancel, add, update, update_extras, confirm_validate, confirm_delete, confirm_deleteline, confirm_clone, confirm_close, confirm_setdraft, confirm_reopen
 	include DOL_DOCUMENT_ROOT.'/core/actions_addupdatedelete.inc.php';
 
@@ -684,6 +724,18 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 	$keyforbreak = 'fk_warehouse';
 	unset($object->fields['fk_project']);
 	unset($object->fields['fk_soc']);
+	// Allow inline edit of qty while MO is in draft status.
+	// Note: editfieldval() does not handle type 'real' (no <input> rendered, only
+	// Save/Cancel buttons appear). So we override the type to 'numeric' only when
+	// the user has actually clicked the edit pencil (action=editqty). This keeps
+	// the read-mode rendering (price() format) untouched.
+	if ($object->status == Mo::STATUS_DRAFT && $permissiontoadd && isset($object->fields['qty'])) {
+		$object->fields['qty']['alwayseditable'] = 1;
+		if ($action == 'editqty') {
+			$object->fields['qty']['type'] = 'numeric';
+		}
+	}
+
 	include DOL_DOCUMENT_ROOT.'/core/tpl/commonfields_view.tpl.php';
 
 	// Other attributes
diff --git a/htdocs/mrp/mo_production.php b/htdocs/mrp/mo_production.php
index 5837880f1e8..a31ab3a6d3e 100644
--- a/htdocs/mrp/mo_production.php
+++ b/htdocs/mrp/mo_production.php
@@ -163,6 +163,46 @@ if (empty($reshook)) {
 		}
 	}
 
+	// Allow editing qty while MO is still in draft status.
+	// IMPORTANT: this handler MUST run BEFORE actions_addupdatedelete.inc.php,
+	// which has a generic 'set<key>' matcher that would intercept 'setqty' and
+	// call $object->fetch() + update() without setting $object->oldQty, so
+	// Mo::updateProduction() would skip the line scaling (its condition is
+	// !empty($this->oldQty)).
+	if ($action == 'setqty' && $permissiontoadd && $object->status == Mo::STATUS_DRAFT) {
+		$newqty = GETPOSTFLOAT('qty');
+		if ($newqty > 0) {
+			$object->oldQty = (float) $object->qty;
+			$object->qty = $newqty;
+			$res = $object->update($user);
+			if ($res > 0) {
+				// Enforce invariant: the 'toproduce' line for the MO's main product
+				// must equal the MO qty. Mo::updateProduction() scales by ratio
+				// (newQty/oldQty) which can drift if the line state was already
+				// inconsistent (e.g. legacy data from before this patch). Realign
+				// the main product line, leaving sub-products and frozen lines
+				// untouched.
+				$object->fetchLines();
+				foreach ($object->lines as $line) {
+					if ($line->role === 'toproduce'
+						&& (int) $line->fk_product === (int) $object->fk_product
+						&& empty($line->qty_frozen)
+						&& (float) $line->qty != (float) $object->qty) {
+						$line->qty = (float) $object->qty;
+						$line->update($user);
+					}
+				}
+				setEventMessages($langs->trans("RecordSaved"), null, 'mesgs');
+			} else {
+				setEventMessages($object->error, $object->errors, 'errors');
+			}
+		} else {
+			setEventMessages($langs->trans("ErrorFieldRequired", $langs->trans("Qty")), null, 'errors');
+		}
+		header("Location: ".$_SERVER["PHP_SELF"]."?id=".$object->id);
+		exit;
+	}
+
 	// Actions cancel, add, update, delete or clone
 	include DOL_DOCUMENT_ROOT.'/core/actions_addupdatedelete.inc.php';
 
@@ -714,6 +754,18 @@ if ($object->id > 0 && (empty($action) || ($action != 'edit' && $action != 'crea
 	$keyforbreak = 'fk_warehouse';
 	unset($object->fields['fk_project']);
 	unset($object->fields['fk_soc']);
+	// Allow inline edit of qty while MO is in draft status.
+	// Note: editfieldval() does not handle type 'real' (no <input> rendered, only
+	// Save/Cancel buttons appear). So we override the type to 'numeric' only when
+	// the user has actually clicked the edit pencil (action=editqty). This keeps
+	// the read-mode rendering (price() format) untouched.
+	if ($object->status == Mo::STATUS_DRAFT && $permissiontoadd && isset($object->fields['qty'])) {
+		$object->fields['qty']['alwayseditable'] = 1;
+		if ($action == 'editqty') {
+			$object->fields['qty']['type'] = 'numeric';
+		}
+	}
+
 	include DOL_DOCUMENT_ROOT.'/core/tpl/commonfields_view.tpl.php';
 
 	// Other attributes