From 77f29aeee9cf04831577db525778d3da1d725650 Mon Sep 17 00:00:00 2001
From: Simon Michael <simon@joyful.com>
Date: Mon, 11 Jul 2022 13:43:01 +0100
Subject: [PATCH] imp: errors: balancednoautoconversion: now different from
 balanced

---
 hledger-lib/Hledger/Data/Balancing.hs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/hledger-lib/Hledger/Data/Balancing.hs b/hledger-lib/Hledger/Data/Balancing.hs
index 2d45c5119..745e45aa5 100644
--- a/hledger-lib/Hledger/Data/Balancing.hs
+++ b/hledger-lib/Hledger/Data/Balancing.hs
@@ -157,7 +157,14 @@ balanceTransactionHelper bopts t = do
     if infer_transaction_prices_ bopts then inferBalancingPrices t else t
   case transactionCheckBalanced bopts t' of
     []   -> Right (txnTieKnot t', inferredamtsandaccts)
-    errs -> Left $ transactionBalanceError t' errs
+    errs -> Left $ transactionBalanceError t' errs'
+      where
+        errs' = errs ++
+          [ "inference of conversion costs has been disallowed"
+          | ismulticommodity && not (infer_transaction_prices_ bopts)
+          ]
+          where
+            ismulticommodity = (length $ mconcat $ map (maCommodities . pamount) $ tpostings t') > 1
 
 -- | Generate a transaction balancing error message, given the transaction
 -- and one or more suberror messages.