[fix] copy false on date_export

models/account_move_line.py

@@ -7,4 +7,4 @@ from odoo import fields, models, api
 class AccountMoveLine(models.Model):
     _inherit = 'account.move.line'
 
-    date_export = fields.Datetime('Date export')
+    date_export = fields.Datetime('Date export', copy=False)