Forward scheduling during MRP run

Hi Experts,

We are trying MRP run with Forward scheduling. Raw material will take 10 days to come in and FG production will take 5 days. If we give Requirement date as today for FG, after MRP run, system is showing FG will be available after 5 days and raw material will be available after 10 days. But practically FG will be avialable after recieving the Raw material (10 days)+ Manufacturing time of FG (5 days) = 15 days will take to get the FG product available. FG would be available only after 15 days.

How can I get correct dates for FG available. Is there any setting still I need to do in the configuration/ master data.

Please help us.

Thanks in advance.