新增

mrp_plm/models/mrp_document.py

@@ -0,0 +1,10 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import fields, models
+
+
+class MrpDocument(models.Model):
+    _inherit = 'mrp.document'
+
+    origin_attachment_id = fields.Many2one('ir.attachment')