hi, back ward scheduling

[Former Member]

hi,

sap gurus,

this query is confusing me

what is the basic difference between

back ward scheduling

and

forward scheduling

i studied sap help (liabrary) from then i got confused much

can any body throw some light on this

plz help me on this.

regards,

balaji.t

09990019711

[Former Member]

I have already discussed this points in thread

Delivery lead time in Sales Order--URGENT

thread id 825911

Please go through that

[Lakshmipathi]

Dear balaji

In backward scheduling, the system first calculates backwards from the order finish date through the float after production to the production finish date. After this the individual operation dates are calculated backwards, starting from the last operation finish date. The first operation start date gives the start of production.

In forward scheduling the system starts from the current date and calculates through the float before production into the future. Then the individual operation dates are calculated starting from the first operation finish date and working forwards into the future.

thanks

G. Lakshmipathi

[Former Member]

Hi

Backward scheduling is the calculation of deadline dates: the arrival time at the customer site is calculated as the earliest possible goods receipt time at the customers unloading point on the requested delivery date. All four of the delivery and transportation scheduling lead times are subtracted from the customer's requested delivery date to determine if this date can be met.

The transit time, loading time, and pick/pack time are subtracted from the customer’s requested delivery date to calculate the required material availability date.

The system calculates backward scheduling as follows:

Requested delivery date minus transit time = Goods issue date

Goods issue date minus loading time = Loading date

Loading date minus transportation lead time = Transportation scheduling date

Loading date minus pick/pack time = Material availability date

By default, the system will calculate delivery dates the closest day, taking into consideration the working days of the shipping point and a rounding profile. In this case the system assumes a 24 hour work day and lead times can be entered in days up to 2 decimal points. This is referred to as daily scheduling.

Precise scheduling calculated down to the day, hour and minute is supported. This allows the scheduling of a delivery within a single day. It is activated by maintaining the working hours for a particular shipping point.

Backward scheduling is always carried out first. If the material availability date or transportation scheduling date is calculated to be in the past, the system must then use forward scheduling.

Forward scheduling is also done if no product is available on the material availability date calculated by backward scheduling. The system does an availability check to determine the first possible date when product will be available. This new material availability date forms the starting point for scheduling the remaining activities. The loading time, pick/pack time, transit time, and transportation lead time are added to the new material availability date to calculate the confirmed delivery date.

hope this helps

Raghu