SUBSEQUENT DEBIT

hi sap brahmas,

I am facing a problem pls find soln asap.my vendor send an extend to the existing invoice.that he do not claim for the transport cost. i entered the invoice with subsequent debt with MIR7and entered in unplanned del cost as it is not mentioned in po.but finance people is not able to do MIRO for that.what is the procedure to post this that is i did correct r not.if not plsexplain the procedure for the above sub.

regards

srinivas kona