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Making System Settings 
To be able to create and process payment cards and bank details in the transaction Change Payment Data, you have to make the required system settings in the Implementation Guide for Contract Accounts Receivable and Payable under Basic Functions ® Contract Partner ® Changes to Payment Transactions. Also make the following system settings as described.
The system saves bank details/payment cards with a unique ID in the master data of the business partner. As standard, in the transaction Change Payment Data, the first ID of the bank details/payment card is created with 0001, the second with 0002. You can change this in event 1053 or 1054. If the system is unable to determine an ID, the user is requested to enter a new ID in a dialog box (see documentation of function module FKK_EVENT_1053_DIAL).
With a function module processed in event 1083, you can make further changes to the contract account when you save the data. In this event, you can, for example, define that the field Posting Control Group changes in the contract account if a customer changes from being a cash payer to a direct debit payer.
Define the event modules in the Implementation Guide for Contract Accounts Receivable and Payable under Program Enhancements ® Define Customer-Specific Function Modules. See also the documentation for the sample function modules FKK_SAMPLE_1053, FKK_SAMPLE_1054, and FKK_SAMPLE_1083.
Creation of Confirmation
If you want to send confirmations, define the form required for the correspondence types 0036 and 0040. To define a standard form proceed as follows:
1. In the Implementation Guide for Contract Accounts Receivable and Payable, choose Basic Functions ® Correspondence ® Define Standard Form Classes for Correspondence and define the form class FI_CA_BANK_MAINTAIN for correspondence type 0036, and form class FI_CA_CCARD_MAINTAIN for correspondence type 0040.
2. Create a copy of the standard form FI_CA_BANK_MAINTAIN_SAMPLE or FI_CA_CCARD_MAINTAIN_SAMPLE and adjust it accordingly.
3. In the Implementation Guide for Contract Accounts Receivable and Payable, choose Basic Functions ® Correspondence ® Define Application Forms for Correspondence and enter the new forms for the correspondence types 0036 and 0040.
For printing confirmations, you have various options in the IMG activity Define Processing Variants. For more information, see the Implementation Guide.
Follow-On Actions
In the Implementation Guide for Contract Accounts Receivable and Payable, under Basic Functions ® Contract Partner ® Changes to Payment Transactions ® Define Set of Rules for Follow-On Actions, define rules that the system is to use to trigger follow-on actions for changes to payment data.
In the IMG activity Define Processing Variants, you can make further settings for the follow-on actions.
Read the documentation for the IMG activities.
