Question on PMCO Table

Hi All,

I have some doubts related to PMCO Table .. I have an order for which confirmation been done as on todays date , 26th April 2011 ..but in PMCO it is reflecting in WRT05 .. here i believe it should reflect in WRT03 for April ... but not sure Y it is reflecting in WRT05 .....i am looking for getting PMCO Costs as per period wise .., any inputs on how to get PMCO cost by period wise ...would be helpful ..

regrds

pm