LIFO-FIFO

Hi,

in material master view accounting 2 there is a field named Lifo-fifo (MBEW-XLIFO).

I have the following questions:

1) Is there any program which set the check box automatically ?

2) Is there any trx which calculate lifo and fifo ?

3) What is the impact of these calculation on material master, do I have to be careful to execute lifo-fifo calculations ?

Thank You very much

Best regards