If you can do the same thing from IEE, use the Debug Console to identify the necessary PL/SQL block to call, and the parameters/values used.

I was able to call the find_part procedure using this:
 

DECLARE
    qty_available       NUMBER := -1;
    location_no         VARCHAR2(60);
    lot_batch_no        VARCHAR2(60);
    serial_no           VARCHAR2(60);
    eng_chg_level       VARCHAR2(60);
    waiv_dev_rej_no     VARCHAR2(60);
    configuration_id    VARCHAR2(60);
    activity_seq        NUMBER := 0;
    handling_unit_id    NUMBER := 0;
BEGIN
    inventory_part_in_stock_api.find_part(
        qty_available,
        location_no,
        lot_batch_no,
        serial_no,
        eng_chg_level,
        waiv_dev_rej_no,
        configuration_id,
        activity_seq,
        handling_unit_id,
        'MX',
        '311-0256-583',
        '*',
        '*',
        '*',
        '*'
    );

    dbms_output.put_line('Quantity Avail = ' || nvl(to_char(qty_available), 'Blank'));
    dbms_output.put_line('Location # = ' || nvl(to_char(location_no), 'Blank'));
    dbms_output.put_line('Lot/Batch No = ' || nvl(to_char(lot_batch_no), 'Blank'));
    dbms_output.put_line('Serial No = ' || nvl(to_char(serial_no), 'Blank'));
    dbms_output.put_line('Eng_Chg_Level = ' || nvl(to_char(eng_chg_level), 'Blank'));
    dbms_output.put_line('Waiv_Dev_Reg_No = ' || nvl(to_char(waiv_dev_rej_no), 'Blank'));
    dbms_output.put_line('Coniguration ID = ' || nvl(to_char(configuration_id), 'Blank'));
    dbms_output.put_line('Activity Sequence = ' || nvl(to_char(activity_seq), 'Blank'));
    dbms_output.put_line('Handling Unit ID = ' || nvl(to_char(handling_unit_id), 'Blank'));

    dbms_output.put_line(serial_no.count);
END;

However, when I tried scrap_part using this:

DECLARE
    catch_quantity      NUMBER := 0;
    contract            VARCHAR2(60) := 'MX';
    part_no             VARCHAR2(60) := '311-0256-583';
    configuration_id    VARCHAR2(60);
    location_no         VARCHAR2(60) := '20642';
    lot_batch_no        VARCHAR2(60);
    serial_no           VARCHAR2(60);
    eng_chg_level       VARCHAR2(60) := '1'; 
    waiv_dev_rej_no     VARCHAR2(60);
    activity_seq        NUMBER := 0;
    handling_unit_id    NUMBER := 0;
    quantity            NUMBER := 1;
    scrap_cause         VARCHAR2(60) := 'MXSCRA01';
    scrap_note          VARCHAR2(60) := '8';

BEGIN
    inventory_part_in_stock_api.Scrap_Part(
        catch_quantity,
        contract,
        part_no,
        configuration_id,
        location_no,
        lot_batch_no,
        serial_no,
        eng_chg_level,
        waiv_dev_rej_no,
        activity_seq,
        handling_unit_id,
        quantity,
        scrap_cause,
        scrap_note
    );

    dbms_output.put_line('catch_quantity = ' || nvl(to_char(catch_quantity), 'Blank'));
END;

I get the error I mentioned.  I’m afraid I don’t know about the debug console.  I used System Info to find the Api and procedure name.

Thank you for suggesting the debug console.  I was able to use that to see I was missing a NUMBER value that needed to be null instead of 0.  I appreciate your quick response!

You can open the Debug Console from one of the top menus in IEE.

Seems we replied at the same time there 🙂 

So, one related question.  Is there a way to undo scrapping a part, after a commit?

Thanks in advance.

Sounds like a question that might get a better answer in a supply chain forum, but we will see...