added changing elements to input and output #10

Author: gregor-j

src/SapRfc.php

@@ -208,7 +208,10 @@ public function invoke(): array
          */
         $params = array_merge(
             $this->getInputParams(
-                $this->getApi()->getInputElements(),
+                array_merge(
+                    $this->getApi()->getInputElements(),
+                    $this->getApi()->getChangingElements()
+                ),
                 $this->getParams()
             ),
             $this->getTableParams(
@@ -235,6 +238,7 @@ public function invoke(): array
          */
         return $this->castOutput(array_merge(
             $this->getApi()->getOutputElements(),
+            $this->getApi()->getChangingElements(),
             $this->getApi()->getTables()
         ), $result);
     }

src/Traits/ApiTrait.php

@@ -107,9 +107,10 @@ private function mapType(string $type): string
     private function mapDirection(string $direction): string
     {
         $mapping = [
-            'RFC_EXPORT' => IApiElement::DIRECTION_OUTPUT,
-            'RFC_IMPORT' => IApiElement::DIRECTION_INPUT,
-            'RFC_TABLES' => ITable::DIRECTION_TABLE
+            'RFC_EXPORT'   => IApiElement::DIRECTION_OUTPUT,
+            'RFC_IMPORT'   => IApiElement::DIRECTION_INPUT,
+            'RFC_CHANGING' => IApiElement::DIRECTION_CHANGING,
+            'RFC_TABLES'   => ITable::DIRECTION_TABLE
         ];
         if (!array_key_exists($direction, $mapping)) {
             throw new SapLogicException(sprintf('Unknown SAP Netweaver RFC direction \'%s\'!', $direction));