[fix] copy false on date_export

models/account_move_line.py

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