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Пример использования API для удаления резервирований позиции:

declare
  l_rsv_rec                inv_reservation_global.mtl_reservation_rec_type;
  l_serial_number_tbl_type inv_reservation_global.serial_number_tbl_type;
  --
  lx_return_status varchar2(1);
  lx_msg_data      varchar2(4000);
  lx_msg_count     number;
begin
  fnd_global.apps_initialize(-1, 20634, 401); --Запасы - Запасы
  for i_cur in (select * from mtl_reservations t
                where 1=1
                      and rownum=1
                      -- and ...
           )
  loop
    l_rsv_rec.reservation_id               := i_cur.reservation_id;
    l_rsv_rec.organization_id              := i_cur.organization_id;          
    l_rsv_rec.inventory_item_id            := i_cur.inventory_item_id;
    l_rsv_rec.demand_source_type_id        := i_cur.demand_source_type_id; 
    l_rsv_rec.demand_source_header_id      := i_cur.demand_source_header_id; 
    l_rsv_rec.demand_source_line_id        := i_cur.demand_source_line_id;  
    l_rsv_rec.primary_uom_code             := i_cur.primary_uom_code;    
    l_rsv_rec.reservation_uom_code         := i_cur.reservation_uom_code;       
  -- l_rsv_rec.reservation_quantity         := 1;--i_cur.reservation_quantity;     
  -- l_rsv_rec.primary_reservation_quantity := 1;--i_cur.primary_reservation_quantity;
    l_rsv_rec.supply_source_type_id        := i_cur.supply_source_type_id;
        
    inv_reservation_pub.delete_reservation(p_api_version_number => 1.0
                                          ,p_rsv_rec            => l_rsv_rec
                                          ,p_serial_number      => l_serial_number_tbl_type
                                          ,x_return_status      => lx_return_status
                                          ,x_msg_count          => lx_msg_count 
                                          ,x_msg_data           => lx_msg_data
                                          );
                                          
    dbms_output.put_line(lx_return_status);   
    if (lx_return_status <> 'S') then    
      fnd_msg_pub.count_and_get(p_encoded => fnd_api.g_false,                               
                                p_count   => lx_msg_count,                               
                                p_data    => lx_msg_data);       
      dbms_output.put_line('ERROR delete_reservation for reservation_id ='
                           ||l_rsv_rec.reservation_id ||':');       
      if lx_msg_count = 1 then      
        dbms_output.put_line(lx_msg_data);    
      else      
        FOR i IN 1 .. lx_msg_count 
        LOOP         
          dbms_output.put_line(fnd_msg_pub.get(fnd_msg_pub.g_next,fnd_api.g_false));
        END LOOP;     
      end if; 
    end if;
    commit;        
  end loop;                                  
                                          
end;

Пример использования API для получения текущего или доступного для резервирования количества для позиции:

declare
  p_organization_id   NUMBER := 155;
  p_inventory_item_id NUMBER := 546;
  --
  p_revision          VARCHAR2(3);
  p_lot_number        VARCHAR2(80);
  p_subinventory_code VARCHAR2(10) := 'VAlVALVAL';
  p_locator_id        NUMBER;  
  --
  lx_qoh    NUMBER; -- Total Quantity (Onhand)
  lx_rqoh   NUMBER;
  lx_qr     NUMBER;
  lx_qs     NUMBER;
  lx_att    NUMBER; -- Available to Transact
  lx_atr    NUMBER; -- Available to Reserve
  --
  lx_return_status VARCHAR2(1);
  lx_msg_count     NUMBER;
  lx_msg_data      VARCHAR2(4000);
begin
  inv_quantity_tree_grp.clear_quantity_cache;
  inv_quantity_tree_pub.query_quantities(
        p_api_version_number         => 1.0,
        p_init_msg_lst               => fnd_api.g_false,
        x_return_status              => lx_return_status,
        x_msg_count                  => lx_msg_count,
        x_msg_data                   => lx_msg_data,
        --
        p_organization_id            => p_organization_id,
        p_inventory_item_id          => p_inventory_item_id,
        p_tree_mode                  => apps.inv_quantity_tree_pub.g_transaction_mode,
        p_is_revision_control        => case when p_revision is null   then FALSE else TRUE end,
        p_is_lot_control             => case when p_lot_number is null then FALSE else TRUE end,
        p_is_serial_control          => FALSE,
                                         
        p_revision                   => p_revision,
        p_lot_number                 => p_lot_number,
        p_subinventory_code          => p_subinventory_code,
        p_locator_id                 => p_locator_id,
                                         
        x_qoh                        => lx_qoh,  -- OnHand Quantity
        x_rqoh                       => lx_rqoh,
        x_qr                         => lx_qr,
        x_qs                         => lx_qs,
        x_att                        => lx_att, -- Available To Transact
        x_atr                        => lx_atr  -- Available To Reserve
                                        );
   if lx_return_status ='S' then
     DBMS_OUTPUT.put_line ('Общее количество: ' || lx_qoh);
     DBMS_OUTPUT.put_line ('Доступно для резервирования: ' || lx_atr);
     DBMS_OUTPUT.put_line ('Доступно для транзакции: ' || lx_att);
   else
    fnd_msg_pub.count_and_get(p_encoded => fnd_api.g_false,
                              p_count   => lx_msg_count,
                              p_data    => lx_msg_data);
 
    dbms_output.put_line('ERROR for p_inventory_item_id='||p_inventory_item_id);
 
    if lx_msg_count = 1 then
      dbms_output.put_line(lx_msg_data);
    else
      FOR i IN 1 .. lx_msg_count LOOP
        dbms_output.put_line(fnd_msg_pub.get(fnd_msg_pub.g_next,
                                             fnd_api.g_false));
      END LOOP;
    end if;
  end if;   
                                           
end;

Так же есть запрос для просмотра текущего количества Модуль INV – Текущее количество для позиции

Select moq.organization_id                   as org_id,
       sysdate                               as date_val,
       moq.inventory_item_id                 as item_id,
       moq.subinventory_code                 as subinventory_code,
       moq.locator_id                        as locator_id,
       moq.lot_number                        as lot_number,
       msi.segment1                          as item,
       msi.primary_uom_code                  as uom_code,
       sum(moq.primary_transaction_quantity) as actual_qty
  from mtl_onhand_quantities_detail moq,
       mtl_system_items_b           msi
where 1=1
      -- msi
      and msi.inventory_item_id  = moq.inventory_item_id
      and msi.organization_id    = moq.organization_id
      --and moq.inventory_item_id  = :1
      --and moq.organization_id    = :2
      --and moq.subinventory_code  = :3
      --and moq.lot_number         = :4
group by moq.organization_id ,
         sysdate,
         moq.inventory_item_id,
         msi.segment1,
         msi.primary_uom_code,
         moq.subinventory_code,
         moq.locator_id,
         moq.lot_number
order by moq.organization_id, moq.inventory_item_id

Так же есть API для просмотра текущего количества OEBS API INV – Текущее количество для позиции (ONHAND)