Can someone pl explain Quota arrangement process in MM?

Hi Folks,
I am new to MM, could someone pl explain the quota arrangement steps step by step anything with screen would be very helpful
for beginners like me with examples. 
Also could some also pl tell me the Source priority in terms of Source of supply?
Thanks.
Steve

Dear,
Quota Arrangements :
In simple words: Distributing the requirements quantity between potential source of suppliers (Vendors) - basing on their order fulfillment capacity.
In business terminology:
Quota arrangements allow you to define target percentages and distribute them between two or more purchasing contracts. A quota arrangement ensures that a contract is guaranteed both a minimum sales volume and a percentage of the total purchasing volume of the product category or product. A quota arrangement has the highest priority in the sourcing process.
Quota Arrangements
Quota Arrangements means a mechanism enabling the system to compute which source of supply to assign to a requirement for a material.
If a material can be obtained from various sources of supply, each individual source of supply can be allocated a quota arrangement. The quota arrangement is valid for a certain period of time and specifies exactly how the receipts are to be distributed amongst each source of supply.
We can set the quota arrangement for in-house production as well as for external procurement. Setting quotas permits the automatic apportionment of a total material requirement over a period to different sources.
Sources of supply can be:
- an individual vendor or outline agreement
- another plant, from which material should be procured
- a production version
Quota Arrangement Usage
The quota arrangement facilitates the determination of the applicable sources of supply for the following at a certain time.
Purchase orders
Scheduling agreement delivery schedules
Planned orders
Purchase requisitions
Materials planning and control
In customizing activity, we specify for each material master record which quota arrangement rule is allowed. We group the usage combinations you have chosen under different keys.
We have to assign quota arrangement usage key to material master record in purchasing or MRP2 view (Maintaining Material Master Record T.Code MM01)
The quota arrangement usage determines whether a material is included in a quota arrangement and which operations lead to a quota arrangement.
We have to maintain the quota file for the material. Here we define the sequence of the sources of supply, the quotas per source of supply and numerous other parameters in the quota file.
Maintaining the Quota File
A quota arrangement file consists of quota arrangement records identifying the source (such as a vendor or an internal plant), the validity period, and the quota allocated to each source.
We can maintain the quota file. Following are the steps for maintaining this file.
T. Code: MEQ1
The initial screen for maintaining quota appears.
Enter the material number and the plant for the material that you want to use to maintain the quota file and choose. The header screen for maintaining quotas appears.
Enter the Valid to date for the quota arrangement item.
We can only define continuous validity periods for one material. In the first interval, the system sets the current date in the Valid from field. The Valid from dates of the other intervals are set continuously so that the day after the end date of the last quota item is set as the start date for the next item.
If we want to work with splitting quota arrangements, we will enter a minimum quantity here.
Double-click on the item to process.
The item screen now appears.
Here we will define the source of supply and other control parameters per item.
Allocating the source of supply to the quota item determines the procurement type that the procurement proposal receives. Therefore, we can specify via the quota arrangement that, for example, 75% of a material is produced in-house and the other 25% is procured externally.
Save entries.
Regards,
Syed Hussain.

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    System model name: iMac7,1 (Mac-F42386C8)
    Right before it happened Time Machine failed to finish back up to Time Capsule wirelessly " due to network problems"; again I was downloading stuff through Vuze and my external WD Studio 1TB was all lit up (which is unusual). For now I have disconnected the external HD.
    Can anyone tell from the reports what might cause this?

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