From ad4a0fc9c11ed0246a659950e1c8bbdd5ef5f396 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jan=20B=C3=BCren?= <jan@kivitendo.de>
Date: Tue, 12 Nov 2019 10:23:18 +0100
Subject: [PATCH] =?utf8?q?Bugfix=20#406=20Fehlerhafte=20abzurechnende=20We?=
 =?utf8?q?rte,=20falls=20Gutschriften=20h=C3=B6her=20als=20Auftragswert?=
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---
 SL/OE.pm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/SL/OE.pm b/SL/OE.pm
index 1d064505b..5665b04bd 100644
--- a/SL/OE.pm
+++ b/SL/OE.pm
@@ -377,8 +377,13 @@ SQL
   while (my $ref = $sth->fetchrow_hashref("NAME_lc")) {
     $ref->{billed_amount}    = $billed_amount{$ref->{id}};
     $ref->{billed_netamount} = $billed_netamount{$ref->{id}};
-    $ref->{remaining_amount} = $ref->{amount} - $ref->{billed_amount};
-    $ref->{remaining_netamount} = $ref->{netamount} - $ref->{billed_netamount};
+    if ($ref->{billed_amount} < 0) { # case: credit note(s) higher than invoices
+      $ref->{remaining_amount} = $ref->{amount} + $ref->{billed_amount};
+      $ref->{remaining_netamount} = $ref->{netamount} + $ref->{billed_netamount};
+    } else {
+      $ref->{remaining_amount} = $ref->{amount} - $ref->{billed_amount};
+      $ref->{remaining_netamount} = $ref->{netamount} - $ref->{billed_netamount};
+    }
     $ref->{exchangerate} = 1 unless $ref->{exchangerate};
     push @{ $form->{OE} }, $ref if $ref->{id} != $id{ $ref->{id} };
     $id{ $ref->{id} } = $ref->{id};
-- 
2.20.1