AbtractBuildForm.php: fix problem with subrecords in MultiDB Environment.

extension/qfq/qfq/AbstractBuildForm.php

@@ -2464,6 +2464,7 @@ abstract class AbstractBuildForm {
         $hasDragAndDrop = false;
         $orderColumn = $formElement[FE_ORDER_COLUMN] ?? DND_COLUMN_ORD;
         $dndTable = '';
+
         if (isset($formElement[FE_DND_TABLE])) {
             // Table is specified in parameter field
             $dndTable = $formElement[FE_DND_TABLE];
@@ -2474,8 +2475,9 @@ abstract class AbstractBuildForm {
                 ROW_REGULAR, [$formName]);
             if (count($form) > 0) { $dndTable = $form[0][F_TABLE_NAME]; }
         }
+
         if ($dndTable) {
-            $columns = $this->dbArray[$this->dbIndexQfq]->sql("SHOW COLUMNS FROM $dndTable");
+            $columns = $this->dbArray[$this->dbIndexData]->sql("SHOW COLUMNS FROM $dndTable");
             foreach ($columns as $column) {
                 if ($column['Field'] === $orderColumn) {
                     // DragAndDrop is active if the dndTable has the orderColumn