sdncCallback should be written as ${sdncCallback}. Used to populate the correct callBack function.

org.openecomp.mso.bpmn.common.scripts.SDNCAdapterUtils.sdncTopologyRequestV2(DelegateExecution, String, String, String, String, String, String, Object, String, String)

Line 574 of the function calls the function below 

    String content =

            """<aetgt:SDNCAdapterWorkflowRequest xmlns:aetgt="http://org.openecomp/mso/workflow/schema/v1"

                                          xmlns:sdncadapterworkflow="http://org.openecomp/mso/workflow/schema/v1"

                                          xmlns:sdncadapter="http://org.openecomp.mso/workflow/sdnc/adapter/schema/v1"

                                          xmlns:ns5="http://org.openecomp/mso/request/types/v1">

                       <sdncadapter:RequestHeader>

                          <sdncadapter:RequestId>${hdrRequestId}</sdncadapter:RequestId>

                          <sdncadapter:SvcInstanceId>${serviceInstanceId}</sdncadapter:SvcInstanceId>

                          <sdncadapter:SvcAction>${action}</sdncadapter:SvcAction>

                          <sdncadapter:SvcOperation>network-topology-operation</sdncadapter:SvcOperation>

                          <sdncadapter:CallbackUrl>sdncCallback</sdncadapter:CallbackUrl>

                       </sdncadapter:RequestHeader>

                       <sdncadapterworkflow:SDNCRequestData>

                          <request-information>