diff --git a/runbot_merge/models/pull_requests.py b/runbot_merge/models/pull_requests.py
index ae48c14f..53386012 100644
--- a/runbot_merge/models/pull_requests.py
+++ b/runbot_merge/models/pull_requests.py
@@ -323,7 +323,9 @@ class PullRequests(models.Model):
     display_name: str
 
     target = fields.Many2one('runbot_merge.branch', required=True, index=True, tracking=True)
+    target_sequence = fields.Integer(related='target.sequence')
     repository = fields.Many2one('runbot_merge.repository', required=True)
+    project = fields.Many2one(related='repository.project_id')
     # NB: check that target & repo have same project & provide project related?
 
     closed = fields.Boolean(default=False, tracking=True)
diff --git a/runbot_merge/views/mergebot.xml b/runbot_merge/views/mergebot.xml
index c1d7418a..3de9738e 100644
--- a/runbot_merge/views/mergebot.xml
+++ b/runbot_merge/views/mergebot.xml
@@ -129,6 +129,8 @@
                     <field name="url" widget="url" class="btn btn-secondary" text="Frontend"/></span>
                 </div>
                 <sheet>
+                    <field name="project" invisible="1"/>
+                    <field name="target_sequence" invisible="1"/>
                     <div class="oe_title">
                         <h1>
                             <field name="repository"/>#<field name="number"/>
@@ -187,7 +189,6 @@
                                     <field name="merge_method"/>
                                     <field name="squash"/>
                                     <field name="draft"/>
-                                    <field name="limit_id"/>
                                 </group>
                                 <group>
                                     <field name="priority"/>
@@ -224,6 +225,7 @@
                         <page name="porting" string="Forward-Porting">
                             <group>
                                 <group>
+                                    <field name="limit_id" domain="[('project_id', '=', project), ('sequence', '&lt;=', target_sequence)]"/>
                                     <field string="Original PR" name="source_id"/>
                                     <field name="parent_id"/>
                                     <field