Is it ok to change the amount on the purchase invoice when selecting a purchase invoice item where the price has changed.
For example, my phone bill could be £10 this month, but next month it could be £12.75 and the next month it could £8! I assume that we need to create a purchase invoice item such as BT Phone Bill for whatever amount it currently is, and then on future invoices we can just change the amount on the actual purchase invoice. Or do we need to go into purchase invoice items, change the price there and then do a purchase invoice and select the purchase invoice item with the updated price. I assume that this won’t change purchase invoices which have the old price?