diff --git a/src/GiftAid.php b/src/GiftAid.php
index 8039f8e..326fbb2 100644
--- a/src/GiftAid.php
+++ b/src/GiftAid.php
@@ -1180,6 +1180,7 @@ public function getResponseErrors()
 
                 $govTalkErrors['business'][] = [
                     'number'   => (string) $gaError->Number,
+                    'message'  => $gaError->Application->Messages->DeveloperMessage ?? '',
                     'text'     => (string) $gaError->Text,
                     'location' => (string) $gaError->Location,
                     'donation_id' => $donationId,
diff --git a/tests/GovTalk/GiftAid/GiftAidTest.php b/tests/GovTalk/GiftAid/GiftAidTest.php
index 88be061..e33692f 100644
--- a/tests/GovTalk/GiftAid/GiftAidTest.php
+++ b/tests/GovTalk/GiftAid/GiftAidTest.php
@@ -492,6 +492,11 @@ public function testMultiClaimSubmissionWithFirstDonationNamesMissing(): void
         $this->assertCount(0, $response['errors']['warning']);
         $this->assertCount(4, $response['errors']['business']);
 
+        $this->assertEquals(
+            "cvc-type.3.1.3: The value '' of element 'Sur' is not valid.",
+            $response['errors']['business'][1]['message'],
+        );
+
         $this->assertEquals(
             "Invalid content found at element 'Sur'",
             $response['errors']['business'][1]['text'],