From d339e421f82de9e2996e45e71d745d81dff2f3f0 Mon Sep 17 00:00:00 2001
From: Nikhil Saraf <1028334+nikhilsaraf@users.noreply.github.com>
Date: Sat, 1 Dec 2018 16:16:11 -0800
Subject: [PATCH] fix op_underfunded issue, fixes #69 (#70)

---
 plugins/sellSideStrategy.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/plugins/sellSideStrategy.go b/plugins/sellSideStrategy.go
index d68c31d75..0e08385f7 100644
--- a/plugins/sellSideStrategy.go
+++ b/plugins/sellSideStrategy.go
@@ -293,7 +293,9 @@ func (s *sellSideStrategy) UpdateWithOps(offers []horizon.Offer) (ops []build.Tr
 			return nil, nil, fmt.Errorf("unable to update existing offers or create new offers: %s", e)
 		}
 		if op != nil {
-			if hitCapacityLimit && isModify {
+			reducedOrderSize := isModify && targetAmount.AsFloat() < utils.AmountStringAsFloat(offers[i].Amount)
+			hitCapacityLimitModify := isModify && hitCapacityLimit
+			if reducedOrderSize || hitCapacityLimitModify {
 				// prepend operations that reduce the size of an existing order because they decrease our liabilities
 				ops = append([]build.TransactionMutator{op}, ops...)
 			} else {