diff --git a/src/API.php b/src/API.php
index 296619c..b4a610e 100644
--- a/src/API.php
+++ b/src/API.php
@@ -428,7 +428,9 @@ final class API
 	{
 		Log::debug(sprintf('%s:Update invoice',static::LOGKEY),['params'=>$parameters]);
 
-		return new Invoice($this->execute('invoice',array_merge($parameters,['method'=>'POST'])));
+		$result = $this->execute('invoice',array_merge($parameters,['method'=>'POST']));
+
+		return new Invoice($result->Invoice);
 	}
 
 	/**
@@ -442,6 +444,8 @@ final class API
 	{
 		Log::debug(sprintf('%s:Update customer',static::LOGKEY),['params'=>$parameters]);
 
-		return new Customer($this->execute('customer',array_merge($parameters,['method'=>'POST'])));
+		$result = $this->execute('customer',array_merge($parameters,['method'=>'POST']));
+
+		return new Customer($result->Customer);
 	}
 }
\ No newline at end of file