If you want to generate the purchasing list you must have to do the following steps:
First of all you have to identify the applicable level of the article hierarchy in locations for the operational assortment planning and control (OAPC).Please make sure that in OAPC the hierarchy nodes that are allocated to overall collections can be scheduled.Lawful mixtures of periods/period years and rollouts are predefined in customizing, which permits you to model delivery months for the stores, let us have an example you not need to plan at the rollout level if you have preserved lawful mixtures deprived of entering a rollout. A variety type such as fashion collection or basic range, collection types are known to be as customer-specific and they are well defined in customizing and are allocated to the variety
The acquiring group is essential for requiring purchase prices (vendor/purchasing organization level) and for the other processes too. Similarly you have to enter in to a purchasing group, which the system uses to determine user approval. You must need both of the sales organization and the distribution channel if you want to find out the sales prices, please make sure that system will fill the data automatically if the article hierarchy is allocated to a given sales organization or distribution channel, or else you can choose them manually.This comes under the environment of material management
As soon as you have generated the list, you would be able to add materials to it. You will find that system will display the overall quantities for the upstream preparation procedures within the units and values .i.e. purchase price and sales price for every key performance and variety. Within the overview area, the system will be able to show a line for the target and a line of collected data from the planned purchasing list with in the line that will help you to indicate the difference between the two of them.
Hope this article might help you to understand the above question.