MRP System Parameters.

Hi,
Can someone tell how MRP uses the demand code 1 & 2 values in the column
"other" in program MRP820D?

I have an item that appears to have used the "other" logic during MRP but I
am not sure why. Here is our setup:

 MRP820D-01                BPCS System Generation            IS001B
2/26/03
 Display                   MRP System Parameters
09:42:17


 Drop F.P.O. scheduled for completion before planning start date? 1 (1=Yes
0=No)

                                                    Repetitive  Other
 Demand Code to be used before the Time Fence            4       1
(1,2,3,4)
 Time Fence (Periods for Repetitive, Days for Other)       1      30
 Demand Code to be used after the Time Fence             1       1
(1,2,3,4)

 Horizon (Periods for Repetitive, Days for Other)         51      10

 Ignore Horizon for Item Types 0 and 5? (Phantoms)       1      (1=Yes 0=No)

 Prorate Forecasts?                                      1      (1=Yes 0=No)

 Holding Cost Percentage. On a yearly basis.              36.00
(2=Decimals)

 Number of Days for Period Lot Sizing                      7



Thanks,
Ted