Use instances when copying analytic account entries to new line

Closes #14988

modules/analytic_account/account.py

@@ -436,6 +436,15 @@ class AnalyticAccountEntry(ModelView, ModelSQL):
             analytic_line.date = date
             yield analytic_line
 
+    @classmethod
+    def copy_to(cls, entries, origin):
+        for entry in entries:
+            new = cls()
+            new.origin = origin
+            new.root = entry.root
+            new.account = entry.account
+            yield new
+
 
 class AnalyticMixin(object):
     __slots__ = ()

modules/analytic_purchase/purchase.py

@@ -26,11 +26,8 @@ class PurchaseLine(AnalyticMixin, metaclass=PoolMeta):
 
         invoice_lines = super().get_invoice_line()
         for invoice_line in invoice_lines:
-            new_entries = AnalyticAccountEntry.copy(self.analytic_accounts,
-                default={
-                    'origin': None,
-                    })
-            invoice_line.analytic_accounts = new_entries
+            invoice_line.analytic_accounts = AnalyticAccountEntry.copy_to(
+                self.analytic_accounts, invoice_line)
         return invoice_lines
 
 

modules/analytic_sale/sale.py

@@ -26,11 +26,8 @@ class Line(AnalyticMixin, metaclass=PoolMeta):
 
         invoice_lines = super().get_invoice_line()
         for invoice_line in invoice_lines:
-            new_entries = AnalyticAccountEntry.copy(self.analytic_accounts,
-                default={
-                    'origin': None,
-                    })
-            invoice_line.analytic_accounts = new_entries
+            invoice_line.analytic_accounts = AnalyticAccountEntry.copy_to(
+                self.analytic_accounts, invoice_line)
         return invoice_lines