unplanned delivery cost g/l account

hi gurus

if i have to post unplanned delivery cost in seperate g/l account . then in miro we have to fill unplanned delivery cost in detail tab page in miro . then where this amount will be posted in which g/l account.is we have to fill g/l account no on the same page or we have to do setting in obyc for unolanned celivery cost.

points will be rewarded

amin