From a49e33a8ce91e07ebcbbb99bd8f01108d578dcc0 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Fri, 16 Mar 2012 00:59:32 -0500
Subject: [PATCH] Don't add price exchanges for a commodity itself

Fixes #703
---
 95350193.test | 6 ++++++
 src/pool.cc   | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 95350193.test

diff --git a/95350193.test b/95350193.test
new file mode 100644
index 00000000..dadb39cf
--- /dev/null
+++ b/95350193.test
@@ -0,0 +1,6 @@
+2011-11-08 * Test
+    Assets:Voucher:Amazon                 137.87 GBP (48H5)
+    Assets:Cash                          -137.87 GBP
+
+test pricedb
+end test
diff --git a/src/pool.cc b/src/pool.cc
index d5494352..5813c0f6 100644
--- a/src/pool.cc
+++ b/src/pool.cc
@@ -277,8 +277,10 @@ commodity_pool_t::exchange(const amount_t&             amount,
   if (! per_unit_cost.is_realzero() &&
       (current_annotation == NULL ||
        ! (current_annotation->price &&
-          current_annotation->has_flags(ANNOTATION_PRICE_FIXATED))))
+          current_annotation->has_flags(ANNOTATION_PRICE_FIXATED))) &&
+      commodity.referent() != per_unit_cost.commodity().referent()) {
     exchange(commodity, per_unit_cost, moment ? *moment : CURRENT_TIME());
+  }
 
   cost_breakdown_t breakdown;
   breakdown.final_cost = ! is_per_unit ? cost : cost * amount.abs();