We had been using the system standard price for a few years and now we would like to change it to FIFO. But when we are using FIFO, when validating the delivery slip, the product without PO currently is saying that it is having a 0 cost and cannot be process, even we had already input the cost in standard price. Yes, we can change the product category to standard and validate that to bypass the error, but we have like 100+ invoice per day so it will consume a lot of time for doing so, is that a setting problem or the system is intended to do that even we have the standard cost? Any way to solve that?