Why partner determinations is that much important and also explain the procedure for Partner determination?

Following explains how to crete a rebate agreement, test it using a sales order and billing it. Then settling it partially or fully using a rebate credit memo. Please use the basic procedure and tweak your IMG settings according to your unique requirements.
Rebate processing: 1. First requirement is that the rebate processing must be active for a. the customer ( check in customer master) , b. for the billing type ( check in IMG > Billing > rebate processing > active rebate processing > select billing documents for rebate processing. ) c. For the sales organizatin: ( check in IMG > Billing> rebate processing > active rebate processing > Active rebate processing for sales org. )
2. Next create a rebate agreement For this ust T-code VB01. For the rebate agreement type you can choose either 0001 ( group rebate ) or 0002 material rebate or 0003 ( customer rebate ) etc b. Enter your rebate conditions. Dont forget to enter the accrual rate here.
3. Now test your rebate functionality : create a sales order for the particular customer, sales org ( ensure that the billing type used in your sales order is relevant for rebate) . Create outbound delivery, transfer order to do picking and post goods issue.
4. Now go to Tcode VB03 and check your rebate by choosing conditions , selecting the condition line and choosing payment data. You will see that the accruals and business volume are updated when accounting doc is created for billing.
5. Settling your rebates: Once your rebates have been accrued you need to settle the rebate. For this first release the rebate for settlement by using Tcode VB02. As a trial basis choose B ( you can choose other settings based on your requirement) and choose Create manual accrual. Now enter the amount to be paid and save the rebate agreement.
6. Next display your rebate agreement using Tcode VB03. Enter your rebate agreement number . Next choose rebate payments > Rebate documents and select partial settlement. Click on the choose button to note down your credit request number.
7. Use Tcode VA02 and release the billing block for your credit request. ( use item overview tab)
8. Now use VF01 to create a rebate credit memo by entering the credit memo request number and save it
9. Now release the credit memo to accounting using vf02.

ales Order Stock
Sales Order Stock are stock with Special Stock type E. It can fall into the usual stock categories such as unrestricted, blocked etc. but "belongs" to a sales order. For example, you create a sales order for a part and assign a sales item category that generates an individual requisition, the requirement has an account assignment linking it to the sales order schedule line, you convert that requisition to a Purchase Order.
When you receive the Purchase Order, the stock is placed in sales order stock. It will show against the sales order/sales order line. It can only be delivered against that sales order line. Any availability check etc for that material on any other sales order will not take it into account as it is not available except to the sales order line the stock is assigned to.
RSM30 - Table View - V_TVEPZ -> Assign schedule line categories
First check the Proposed schdule line category (SchLC) - double click on the line item
VOV6 - Maintain the schedule line categories - double click on the line item
For example, you can control the default returns movement type.
651 - two steps - with a transfer posting using 453
653 - one steps - direct post to unrestricted used
Control the Transaction Flow (tick to activate the function)
transfer of requirement
for availability check for sales
production allocation active