Urgent - WIP Operation Update using wip_mass_load_pub not working

 Hi,

 I am building a custom process which creates and updates WIP job operations and components using wip_massload_pub API. I am able to sucessfully create operations and components by loading the header table wip_job_schedule_interface with load_type = 4 (non standard discrete job) and wip_job_dtls_interface with load_type = 3(Operations) and substitution_type = 2 (Add).

However when I trying to update the created operation I am having trouble in inserting correct data into the interface tables. I have loaded a null record in wip_job_schedule_interface with only group_id and load_type = 3 (Update non standard job) and populated the wip_job_dtls_interface with the same group_id in header and wip_entity_id of the original created job and parent_header_id  is null and