Workflow not getting triggered from webdynpro

Hello experts,

I am trying to trigger class based workflow from webdynpro. FM used is SAP_WAPI_CREATE_EVENT. Created the event SUBMIT in the class ZMM_MATUPD and activated the linkage in SWETYPV.

CALL FUNCTION 'SAP_WAPI_CREATE_EVENT'
    EXPORTING
      OBJECT_TYPE            = 'ZMM_MATUPD'  "lv_objecttype
      OBJECT_KEY              = '0000000011'        "lv_objectkey
      EVENT                         = 'SUBMIT'               "lv_event
     IMPORTING
       RETURN_CODE         = lv_return

     TABLES
       INPUT_CONTAINER   = lt_container

The return code lv_return value is 1.

Are there any steps that I am missing from workflow or class or webdynpro due to which the workflow is not triggering ?