INV_MOVE_ORDER_PUB.Process_Move_Order does not correctly insert multiple record

INV_MOVE_ORDER_PUB.Process_Move_Order does not correctly insert multiple record - Abnormal behavior

using this API. I dont know if this is a bug. Please see below API. I just tweak the API to insert multiple rows per header and details

here's my code

CREATE OR REPLACE PROCEDURE ProcessMoveOrder

AS

        -- Common Declarations

        l_api_version    NUMBER := 1.0;

        l_init_msg_list VARCHAR2(2) := FND_API.G_TRUE;

        l_return_values    VARCHAR2(2) := FND_API.G_FALSE;

        l_commit        VARCHAR2(2) := FND_API.G_TRUE;

        x_return_status VARCHAR2(2);

        x_msg_count      NUMBER := 0;

        x_msg_data         VARCHAR2(255);

   

        -- WHO columns

        l_user_id NUMBER := -1;