MRP Scheduling

Hi,

I have a material MRP type PD, planned delivery time 7 days, GR processing time 2 days.

Stock requirement scenario is as below:

Current stock (15.09.10) = 5

Reservation (req date 15.09.10) = 20

PR (24.09.10) = 15

Reservation (req date 25.09.10) = 15

Reservation (req date 30.09.10) = 2

On planning run (MD03), MRP is creating procurement proposal , availability date 08.10.2010

I wonder why MRP id creating procurement proposal for 08.10.10 ? Though it is giving exception 30, meaning requesting user to reschedule this proposal to 25.09.10 and 30.09.10. Why MRP is not directly scheduling proposals on these dates (which is the correct date).

Pls see if you can help.

Thanks and regards,

TS