SD Questions

hi,

plese send me the answer of following SD questions :

1. why is requirement routine used in pricing procedure? how do we ensure that a condition not picked up in a pricing procedure?

2. what are the different labels in which a condition can be used in a pricing procedure? how do you ensure that a condition value is applicable for pricing in the sales document but does not get posted to G/L account?

3. why do we define access sequence? how is it related to a key? what does the 'exclusive' indicator denote in an access sequence?

thanking you,

Raj.