VALUE(TASK_GUID) TYPE BAPI_TS_GUID-TASK_GUID
VALUE(IV_ORIGINAL_TASK_GUID) TYPE BAPI_TS_GUID-TASK_GUID
VALUE(IV_RELATED_TASK_GUID) TYPE BAPI_TS_GUID-TASK_GUID
VALUE(IV_TASK_GUID) TYPE BAPI_TS_GUID-TASK_GUID