how to get Worktask Object with Table Structure

Hello Everybody.

im currently using following rfc-function call to fetch the full container of my worktask with ID = lv_workitemid

call function 'SAP_WAPI_READ_CONTAINER' destination LV_RFCDEST

         exporting

           WORKITEM_ID      = LV_WORKITEMID

           LANGUAGE         = SY-LANGU

           USER             = SY-UNAME

         importing

           RETURN_CODE      = EV_RETURN

         tables

           SIMPLE_CONTAINER = LT_SIMPLE_CONTAINER

i'll get a table with key-value pairs. one of the values should be a table structure.

Questions:

a) how can i get this container object with a table in it?

b) how can i put the modified table back to the worktask container?

Thanks for quick help ;-)

Danilo Vorpahl