diff --git a/vorgang-manager-interface/src/main/protobuf/vorgang.model.proto b/vorgang-manager-interface/src/main/protobuf/vorgang.model.proto
index ffe4cc45c2feb899ba7cd64424588035cf4f3770..6cb340282fed34aa603ea49cde9b6bc5453467cd 100644
--- a/vorgang-manager-interface/src/main/protobuf/vorgang.model.proto
+++ b/vorgang-manager-interface/src/main/protobuf/vorgang.model.proto
@@ -213,8 +213,7 @@ message GrpcCreateCollaborationVorgangRequest {
 message GrpcCreateCollaborationRequestData {
   string vorgangId = 1;
   int32 collaborationLevel = 2;
-  reserved 3;
-  string organisationEinheitId = 4;
+  string organisationEinheitId = 3;
 }
 
 message GrpcCreateCollaborationVorgangResponse {