Why do transaction import (Inventory Misc.) get GL Date to end date of inventory account period?

Hi,

    At a R11-Test instance of my customer, I suspected the Transaction Import with Inventory Misc. (PA_TRANSACTION_INTERFACE_ALL) get the GL_DATE Value set to end date of each inventory accounting period.  Such as, 

  Inventory Period  set  NOV-14     =   26-Oct-14    to  25-Nov-14

  PA & GL Period  set  NOV-14     =  1-Nov-14       to  30-Nov-14

  When user create the inventory transaction as of  27-Oct-14 which charge to Project (Inventory Period = NOV-14) and transfer to Project module.   Table PA_TRANSACTION_INTERFACE_ALL get the GL_DATE field set to end date of Inventory accounting period (25-Nov-14).    I amazed the cause of this value GL_DATE.  Why can GL_DATE get the end date of each inventory period?