Account Substitution 
You can set up account substitution so that system substitutes account information based on a defined account substitution rule. You can create rules for an enrichment and validation check by using a BAPI in the standard system or by using the Manage Account Substitution Data transaction.
Note
This document describes how to create rules by using the Manage Account Substitution Data transaction.
Prerequisites
You have defined the settings for account substitution. To do this, on the SAP Easy Access screen, choose 
Payment Engine 
Referential Data Account Substitution Manage Account Substitution Data 
(transaction /PE1/MN_ACCSUBS).
Features
Matching
So that the system can identify the correct account for substitution, specify one field or a combination of fields:
IBAN
BIC and account number
Bank country, bank key and account number
Recommendation
You can use the wildcards * and + in the above fields.
However, for performance reasons, we recommend that you limit the amount of entries with wildcards.
You can use the following fields to narrow down the set of matches:
Referential BIC
PE Transaction Type
Bank Country
Referential Country
Referential Bank Key
Referential IBAN
Account Holder
Holder of Referential Account
Transaction Amount from/to
Remittance Match Code
Note
Fields that you do not specify are not included in the matching process.
When matching according to transaction amount, you must specify a lower limit and an upper limit with the corresponding currency. Transaction amounts outside that amount interval are excluded from the match list.
If you specify a remittance match code, the system scans the remittance of type unstructured remittance information (/320) of the payment item for the defined pattern.
Consider adding a preceding and a trailing wildcard (*) for remittance match codes. In this way, the system will also retrieve longer remittance information that includes the match code. Using wildcards within the remittance check does not impede performance.
You can specify matching data in addition to account information in the following cases:
You want payments that are targeted for a specific account to be distributed to a set of accounts according to further rules (1 : n).
When you use wildcards and the retrieved substitution data is not unique but should be restricted further (n : 1).
Retrieval according to specificity
If several matching substitution records, the system selects one record according to the following criteria (with decreasing precedence):
Match Code has been specified
Amount to has been specified
Preference for higher values of the field sequence number
Check method – activation and implications
The enrichment and validation check method is /PE1/CL_PO_E_EV_CHECK_PI, CHECK_E_ACC_SUBSTITUTION.
If the system finds a matching account substitution record, the system replaces the account information of the payment item with (non-initial) substitution fields.