Material Column Invisible in Purchase Order Screen after Technical Upgrade

Hi Freinds,

Subject: MEPO1211-EMATN field invisible in Purchase Order (ME21N)

We are doing an SAP Technical upgrade project from 4.6C to ECC6.0. The 4.6C developement box is upgraded to ECC6.0. I found that the Material Column is missing from the Purchase Order Item.

In the right side of item screen, we can see the configuration icon. I have checked that configuration icon - Administrator - MEPO1211-EMATN - field is enabled in the invisible column.

I tried all the possible ways to disable the tick mark. still problems persists.

please let me know how to disable the tick mark (MEPO1211-EMATN)

Thanks

Ashok