Invoice Correction Request (RK) - Unable to edit debit line items.

Hi all

When creating an invoice correction request (RK) with reference to an invoice, most of the times I am able to edit the pricing on Debit line items and successfly create the correction request. But in some cases, I am not able to edit the debit line items, all the filed in the pricing are geryed out. It appears very random as in which cases it is happening so.

I checked all the fields starting from item categories, document type, statuses and I dont see any difference from the ones where I was able to successfully create the correction request.

One more case is that, I tried to create correction request for an invoice with 3 line items. It created 3 credit lines and 3 debit lines. Of the 3 debit lines, I am able to edit only one of them the rest 2 are greyed out.

I am not able to figure out what going on there.Any help would be highly appreciated.

Thanks

Vamsi