diff --git a/issue3131002_20001.diff b/issue3131002_20001.diff
deleted file mode 100644
index ea5b284..0000000
--- a/issue3131002_20001.diff
+++ /dev/null
@@ -1,31 +0,0 @@
-Index: invoice.py
-===================================================================
-
---- ./modules/account_invoice/invoice.py
-+++ ./modules/account_invoice/invoice.py
-@@ -6,7 +6,8 @@
- import operator
- from sql import Literal
- from sql.aggregate import Count, Sum
--from sql.conditionals import Coalesce
-+from sql.conditionals import Coalesce, Case
-+from sql.functions import Abs
- 
- from trytond.model import Workflow, ModelView, ModelSQL, fields
- from trytond.report import Report
-@@ -589,7 +590,13 @@
-                     condition=invoice.move == move.id
-                     ).join(line, condition=move.id == line.move
-                     ).select(invoice.id,
--                    Coalesce(Sum(line.debit - line.credit), 0).cast(type_name),
-+                    Coalesce(Sum(
-+                            Case((line.second_currency == invoice.currency,
-+                                    Abs(line.amount_second_currency)
-+                                    * Abs(line.debit - line.credit)
-+                                    / (line.debit - line.credit)),
-+                                else_=line.debit - line.credit)),
-+                        0).cast(type_name),
-                     where=(invoice.account == line.account) & red_sql,
-                     group_by=invoice.id))
-             for invoice_id, sum_ in cursor.fetchall():
-
diff --git a/series b/series
index 9fbff87..c53fe94 100644
--- a/series
+++ b/series
@@ -1,4 +1,3 @@
-issue3131002_20001.diff
 issue136_416.diff
 issue971002_217001.diff
 #issue2341002_1_10001.diff