How to add PO Distribution DFF in Buyer work Center (Purchasing) Orders-Distributions tab OAF page?

Hi,

I am trying to add PO Distributions DFF on Orders-distributions tab in Buyer Work Center.

There is a option to add DFF in Orders-Header tab using Flex: (HeaderRN.DescFlexfields) through personlization.

But i could not able to find any DescFlexfields in DistributionRN.

Is there any other way to add PO Distribution DFF on DistributionRN?

Can anyone help me on this issue?

Thanks,

mv