ME 777 - Ordered material & differs from material & in delivery?

Hi Experts,

Am ceating inbound deliveries from POs by using BBP_INB_DELIVERY_CREATE.

Issue: MATNR is NOT populating/blank for LIPS entry, which entry created with the above FM.

When I degugeed, found out that, in FM- ME_CONFIRMATION_EDI, in Routine KOMDLGN_SORT,

am getting this erorr as "ME 777 - Ordered material & differs from material & in delivery?", actually, I double checked that, both PO line item MATNR and intended delivery line item MATNR r the same!!

Actuallly, ME_CONFIRMATION_EDI is moving the t_kom-EMATN to t_kom-MATNR(at one point this t_kom-EMATN is erasing by system it self!!)

Resulting NO MATNR value in LIPS entry/line item!!!!

Then,

Why am getting this erorr?

How to resolve it?

Is there any OSS NOTE?

thanq