Payment Structure and Payment Structure Variants 
You use the payment structure to define the financial mathematics conditions (such as type and number of periods, frequency, when due in period, installments to be paid, interest to be paid, as well as validity period) according to which payments are made in a leasing deal. You can configure the payment structure to meet the specific requirements of the lessee.
SAP Leasing provides a generic concept for the payment structure: You can define as many payment structure variants as you want in Customizing and then assign these in the master data of the financing product. In the product you can assign several variants to a pricing process. When you create a product in the master data, you enter the specific details for the variant in the payment structure. This means that you always use different variants for pricing.
You can use the following functions within the payment structure:
Payment structures with annuities
Installment repayment structures
Deferral of repayments and interest in the payment structure
Broken periods with settings for pro-rated calculations
Different payment frequencies for interest payments and repayments
Weekly payments in the payment schedule
Up to three concurrent fees in the payment schedule
Working day shift based on financial mathematics
You have made the following settings in Customizing by choosing
In the master data of the financing product, select the required pricing processes and assign to these the payment structure variants that you want to use for the product. You must use the Default indicator to specify which payment structure variants are used by default.