GME_API_PUB.INSERT_MATERIAL_LINE API error....

Hi All,

I have a task to add line in material detail in workbench through API. I found GME_API_PUB and worked but when i execute this script found error, please advice what i am missing here

x_message_count: 10

x_message_list: No keys specified to identify the rows in the table mtl_system_items_b.

Declare

  v_locator_code        varchar2(100) := 'HUBCTN0001.L01.R01.B001';

  v_org_code            varchar2(100) := 'F1888 OPM Fiber HUB';

  v_batchstep_no        number := 20;

  v_message_count       number;

  v_message_list        varchar2(1000);

  v_return_status       varchar2(1000);

  v_gme_master          gme_batch_header%rowtype;

  v_gme_detail          gme_material_details%rowtype;