Reoder point calculation don't give the expected result

Dear friends,

We are using CBP to set reorder point (MRP type is VM).

We've set the planned delivery time, on MRP2 view, as 120 days.

When we run the forecast, the calculated basic value gives the expected

result, but the reorder point don't.

As we've set Planned delivery time as 120 days, we expect that the

reorder point is "basic value"*4 (4 is the result 120/30). But the result

of the reorder point is is greater (aprox. "basic value"*4,5).

Can you please give me a help on this matter?

Many thanks,

Afonso Pereira