
There are several types of payment methods in FI-CA that are initiated internally. These payment methods are used in connection with the payment program (payment run).
If an incoming payment method is valid (not locked), it's the responsibility of the company to collect the money. For this reason, dunnings do not include open items of this kind.


The payment method ensures that items with payment methods and items without payment methods are processed separately.
The payment method of the document is not compared with the contract account. It ensures that any amount limits specified for this item are ignored (so that, for example, after a contract is canceled, minimal amounts that would not usually lead to a transfer or a collection can still be paid automatically).
The payment method classification specifies whether a check is to be created, whether the payment is from a post office bank account, or whether the payment method is to be used for incoming payments.

The responsible company code has the same function as the paying company code in FI-GL (posting the bank line item responsible for house banks, sender of payment orders).
Other entries relating to payment are determined separately for outgoing and incoming payments within a contract account master record. In both cases, you have the following options:
Bank data of a business partner can be specified.
Payment methods specified can be overwritten by entries in the document.
A contract account can be locked for outgoing or incoming payments. You can enter default values for the lock duration in customizing (if you create a payment lock without specifying the duration of its validity). Furthermore, when debit memos fail, automatic debits can be prevented until a processing lock date is reached.
If an alternative payer is specified for a contract account, the contract account items of a business partner are all paid together. Payment methods, banks, and locks are determined using this offsetting contract account.

A due date is determined by three dates: the cash discount date, the specified due date for net payment, and the deferral date.
If you send an invoice with multiple items, you can use the grouping functionality, but all items are to be collected with one amount. Grouping ensures that items with the same grouping term are paid together.
You can use the Only Clearable indicator when posting an item to ensure that items cannot be paid out or collected. Instead, the amount to be collected or paid out can be cleared only with other debit entries.
You can use event 0652 to override the automatic selection of partner banks created by the payment program. In the standard system, the partner bank is selected as a result of the bank details defined in the contract account (differentiated by incoming and outgoing payment).
You can override this by explicitly specifying bank details in the line item. However, it's not possible, for example, to select a partner bank based on the currency of the items paid if these bank details are not entered in each of the items to be paid.

[1] Receivable posting
[2] Payment in FI-CA (payment run)
[3] Payment in FI-GL (outgoing bank statement)