Implementation restriction 'apps.fnd_api.g_false' call from custom form

Question

Hi guys
the following PL/SQL bit executes successfully from a toad session. db user "apps"
SET SERVEROUTPUT ON;
DECLARE
v_api_return_status  VARCHAR2 (1);
v_qty_oh             NUMBER;
v_qty_res_oh         NUMBER;
v_qty_res            NUMBER;
v_qty_sug            NUMBER;
v_qty_att            NUMBER;
v_qty_atr            NUMBER;
v_msg_count          NUMBER;
v_msg_data           VARCHAR2(1000);
v_inventory_item_id  VARCHAR2(250) := '24445';
v_organization_id    VARCHAR2(10)  := '110';
BEGIN
inv_quantity_tree_grp.clear_quantity_cache;
DBMS_OUTPUT.put_line ('Transaction Mode');
DBMS_OUTPUT.put_line ('Onhand For the Item :'|| v_inventory_item_id );
DBMS_OUTPUT.put_line ('Organization        :'|| v_organization_id);
apps.INV_QUANTITY_TREE_PUB.QUERY_QUANTITIES
(p_api_version_number  => 1.0,
p_init_msg_lst        => apps.fnd_api.g_false,
x_return_status       => v_api_return_status,
x_msg_count           => v_msg_count,
x_msg_data            => v_msg_data,
p_organization_id     => v_organization_id,
p_inventory_item_id   => v_inventory_item_id,
p_tree_mode           => apps.inv_quantity_tree_pub.g_transaction_mode,
p_onhand_source       => 3,
p_is_revision_control => FALSE,
p_is_lot_control      => FALSE,
p_is_serial_control   => FALSE,
p_revision            => NULL,
p_lot_number          => NULL,
p_subinventory_code   => 'KSP-02', --NULL,
p_locator_id          => NULL,
x_qoh                 => v_qty_oh,
x_rqoh                => v_qty_res_oh,
x_qr                  => v_qty_res,
x_qs                  => v_qty_sug,
x_att                 => v_qty_att,
x_atr                 => v_qty_atr);
DBMS_OUTPUT.put_line ('on hand Quantity                :'|| v_qty_oh);
DBMS_OUTPUT.put_line ('Reservable quantity on hand     :'|| v_qty_res_oh);
DBMS_OUTPUT.put_line ('Quantity reserved               :'|| v_qty_res);
DBMS_OUTPUT.put_line ('Quantity suggested              :'|| v_qty_sug);
DBMS_OUTPUT.put_line ('Quantity Available To Transact  :'|| v_qty_att);
DBMS_OUTPUT.put_line ('Quantity Available To Reserve   :'|| v_qty_atr);
END;However, while called from a custom form, we receive the following error starting with 'apps.fnd_api.g_false' cannot directly access remote package variable or cursor.
Does it mean, if we need to call the API through a custom form we should initiate any POLICY CONTEXT(s)? if we change the same like below code, the API call compiles successfully and we are able to display the results over the custom form objects.
DECLARE
v_api_return_status  VARCHAR2 (1);
v_qty_oh             NUMBER;
v_qty_res_oh         NUMBER;
v_qty_res            NUMBER;
v_qty_sug            NUMBER;
v_qty_att            NUMBER;
v_qty_atr            NUMBER;
v_msg_count          NUMBER;
v_msg_data           VARCHAR2(1000);
v_inventory_item_id  VARCHAR2(250) := :QTY_HEADER.ITEM_ID;
v_organization_id    VARCHAR2(10)  := '110';
BEGIN
inv_quantity_tree_grp.clear_quantity_cache;
apps.INV_QUANTITY_TREE_PUB.QUERY_QUANTITIES
(p_api_version_number  => 1.0,
--p_init_msg_lst        => apps.fnd_api.g_false,
p_init_msg_lst        => 'F', --Value manually assigned
x_return_status       => v_api_return_status,
x_msg_count           => v_msg_count,
x_msg_data            => v_msg_data,
p_organization_id     => v_organization_id,
p_inventory_item_id   => v_inventory_item_id,
--p_tree_mode           => apps.inv_quantity_tree_pub.g_transaction_mode,
p_tree_mode           => 2, -- value manually assigned
p_onhand_source       => 3,
p_is_revision_control => FALSE,
p_is_lot_control      => FALSE,
p_is_serial_control   => FALSE,
p_revision            => NULL,
p_lot_number          => NULL,
p_subinventory_code   => 'KSP-02', --NULL,
p_locator_id          => NULL,
x_qoh                 => v_qty_oh,
x_rqoh                => v_qty_res_oh,
x_qr                  => v_qty_res,
x_qs                  => v_qty_sug,
x_att                 => v_qty_att,
x_atr                 => v_qty_atr);
:QTY_HEADER.ONHAND_QTY := v_qty_oh;
:QTY_HEADER.RES_QTY := v_qty_res;
END;Please input your valued suggestions.
regards,

Answer 1

Done, by creating a database stored procedure and returning values. Example procedure as following:
CREATE OR REPLACE PROCEDURE xx_retrive_quantity (item_id       NUMBER,
                                                 org_id        NUMBER,
                                                 subinv        VARCHAR2,
                                                 oqtt      OUT NUMBER,
                                                 oqtr      OUT NUMBER)
IS
   v_api_return_status   VARCHAR2 (1);
   v_qty_oh              NUMBER;
   v_qty_res_oh          NUMBER;
   v_qty_res             NUMBER;
   v_qty_sug             NUMBER;
   v_qty_att             NUMBER;
   v_qty_atr             NUMBER;
   v_msg_count           NUMBER;
   v_msg_data            VARCHAR2 (1000);
   v_inventory_item_id   VARCHAR2 (250) := item_id;
   v_organization_id     VARCHAR2 (10) := org_id;
   v_subinventory_code   VARCHAR2 (20) := subinv;
BEGIN
   inv_quantity_tree_grp.clear_quantity_cache;
   apps.INV_QUANTITY_TREE_PUB.QUERY_QUANTITIES (
      p_api_version_number    => 1.0,
      p_init_msg_lst          => apps.fnd_api.g_false,
      x_return_status         => v_api_return_status,
      x_msg_count             => v_msg_count,
      x_msg_data              => v_msg_data,
      p_organization_id       => v_organization_id,
      p_inventory_item_id     => v_inventory_item_id,
      p_tree_mode             => apps.inv_quantity_tree_pub.g_transaction_mode,
      p_onhand_source         => 3,
      p_is_revision_control   => FALSE,
      p_is_lot_control        => FALSE,
      p_is_serial_control     => FALSE,
      p_revision              => NULL,
      p_lot_number            => NULL,
      p_subinventory_code     => v_subinventory_code,
      p_locator_id            => NULL,
      x_qoh                   => v_qty_oh,
      x_rqoh                  => v_qty_res_oh,
      x_qr                    => v_qty_res,
      x_qs                    => v_qty_sug,
      x_att                   => v_qty_att,
      x_atr                   => v_qty_atr
   oqtt := v_qty_att;
   oqtr := v_qty_atr;
END xx_retrive_quantity;This stored procedure could be called from a custom form or report by passing values. Hope this is useful for few others out there. A complete writeup is available over here
http://windows7bugs.wordpress.com/2011/04/17/oracle-ebs-r12-how-to-call-standard-apipackages-from-custom-form-or-reports/