Updation of work order through api

Hi All,

Am updating work order's routing alternate, routing revision, routing revision date through below api.  Could find that work order got updated with the latest routing alternate details but did not given even 1 operation.

wip_massload_pub.massloadjobs (

            p_groupid           => p_group_id,                     -- Group ID

            p_validationlevel   => 0,                      -- Validation Level

            p_commitflag        => 0,             -- --commit 1 =Yes , 0 ='No'

            x_returnstatus      => p_char_returnstatus,

            x_errormsg          => p_char_errormsg);

But when I update the routing alternate manually , got the routing operations.

Can some one help me in this please.

Thanks, Raju