Order lines not showing up in Allocation 15.0

Hi,

While trying to create a standard allocation with source as PO

But that PO has some lines fully received and some lines not received at all.

All the other attributes of Order are like below

• The PO is  approved (ORDHEAD.STATUS = 'A')
• The order type is Non Basic (ORDHEAD.ORDER_TYPE = 'N/B')
• The order location type is Warehouse (ORDLOC.LOC_TYPE = 'W')
• The PO is not fully received/allocated. The following condition is met: ORDLOC.QTY_ORDERED - ORDLOC.QTY_RECEIVED - ALC_XREF.ALLOCATED_QTY > 0

Could you please let me know if I am missing any thing here.