diff --git a/src/Command/CleanMobileCommand.php b/src/Command/CleanMobileCommand.php
index 7fcfe05..3b5ec8d 100644
--- a/src/Command/CleanMobileCommand.php
+++ b/src/Command/CleanMobileCommand.php
@@ -192,6 +192,7 @@ final class CleanMobileCommand extends Command
             if ($row['HANDY_E164']) {
                 $uuid = Uuid::v4();
                 $study_id = "QMBEFR-" . $uuid->toString();
+                $study_id_chain = "QMBEFR-SPENDE-" . $uuid->toString();
 
                 // Create a Contact entity for DB insertion
                 $contact = new Contacts();
@@ -206,7 +207,7 @@ final class CleanMobileCommand extends Command
                 $contact->setParsedFileLine(implode(';', $row));
 
                 try {
-                    $this->http->request('POST', $this->backendApiURL . "/" . $study_id, [
+                    $this->http->request('POST', $this->backendApiURL . "/" . $study_id . "/" . $study_id_chain, [
                         'body' => '',
                         'headers' => [],
                     ]);