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diff --git a/addons/mrp/models/mrp_document.py b/addons/mrp/models/mrp_document.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import fields, models
+
+
+class MrpDocument(models.Model):
+    """ Extension of ir.attachment only used in MRP to handle archivage
+    and basic versioning.
+    """
+    _name = 'mrp.document'
+    _description = "Production Document"
+    _inherits = {
+        'ir.attachment': 'ir_attachment_id',
+    }
+    _order = "priority desc, id desc"
+
+    ir_attachment_id = fields.Many2one('ir.attachment', string='Related attachment', required=True, ondelete='cascade')
+    active = fields.Boolean('Active', default=True)
+    priority = fields.Selection([
+        ('0', 'Normal'),
+        ('1', 'Low'),
+        ('2', 'High'),
+        ('3', 'Very High')], string="Priority", help='Gives the sequence order when displaying a list of MRP documents.')