Hi, I have setup a product which is proratable I have the system set to prorata to the 1st of the month If I generate an invoice for the 1st Jan, I get the response Closing invoices will roll expiration till 1 Feb, Next invoice will roll 1 March rest are ok. However, if I start the invoice say 18 Dec, closing invoice will roll till the 1 Feb which is ok. The problem is the next invoice will have closing invoice will roll expiration till 2 (or 3) of March, The next invoice will prorata 1 May, next invoice might be 2 June. regards Tim