Determination Process

The determination process of account assignment references starts when an over-the-counter (OTC) transaction or security purchase is created.
During the determination process of account assignment references, the system runs through the following sequence:
- The system searches for a suitable substitution rule. If it finds a suitable substitution rule, it uses it to determine the account assignment reference.
- If the system can not find a suitable substitution rule, it searches for a suitable determination rule. If it finds a suitable determination rule, it uses it to determine the account assignment reference.
- If the system can not find a suitable determination rule either, it derives the account assignment reference using predefined rules in the content.
The single items and dependent Fiori apps will be analyzed in more detail below.

The Account Assignment Reference - OTC Transactions (Substitution Rules) app helps you to display, change, and create substitution rules to determine the account assignment references of OTC transactions. Account assignment references are assigned to each treasury position. You use the account assignment reference to determine the G/L account in which a treasury position is managed.
The substitution rules are executed during the automatic process for determining account assignment references when an OTC transaction is created.
Rules for the determination of account assignment references can be defined by you and are predefined in the content:
- You can define rules in the Account Assignment References - OTC Transactions (Substitution Rules) and Account Assignment References - Securities (Substitution Rules) configuration apps
- If you have the Define Determination Rules - Account Assignment References in use, the settings are still relevant for the determination process of account assignment references.
- The predefined content also contains derivation rules that are also still relevant for the determination of account assignment references.
During the determination of account assignment references, the system runs through the previously described sequence.
The table exemplifies the different fields for available defining preconditions by business context. This enables you to substitute values of target fields dependent on attributes specific to the business context. The target field is the Account Assignment Reference of Position Management.

Using the Account Assignment Reference - Securities (Substitution Rules) app, you can display, change, and create substitution rules to determine the account assignment references of securities. Account assignment references are assigned to each treasury position. You use the account assignment reference to determine the G/L account in which a treasury position is managed.
The substitution rules are executed during the automatic process for determining account assignment references when a securities transaction is created.
You manage substitution rules by business context. A context represents the circumstances in which the substitutions are defined and applied. It determines the fields that are available for the definition of rules.
At runtime, business users create financial transactions. This triggers the automatic determination of the account assignment references for the corresponding treasury positions, and the rules that you have defined are applied automatically. In case of a substitution the system derives, replaces, or clears values for the relevant fields defined in the substitution rules. The substitutions take place at the time of data entry with no system messages.
View the previous example to learn about how the target field (account assignment reference) is derived.

Using the Define Determination Rules - Account Assignment References app, you can define rules for the automatic determination of account assignment references for parallel valuation areas. You define the rules for each product group and subledger position that enables you to make postings to a position. Business rules for OTC Transactions and Securities are available.
NoteThe Account Assignment References - OTC Transactions (Substitution Rules) and Account Assignment References - Securities (Substitution Rules) apps replace this app. The Define Determination Rules - Account Assignment References app is deprecated and will soon be deleted from the launchpad. We recommend that you switch to the successor apps.
NoteThe Define Determination Rules - Account Assignment References app is deprecated and will soon be removed from the launchpad. However, if you have the Define Determination Rules - Account Assignment References app already in use, the settings are still relevant for the determination process of account assignment references.

Various account assignment references are predefined in the Define Account Assignment References configuration step under the following: Manage Your Solution → Configure Your Solution → Finance → Treasury and Risk Management → Treasury Accounting.
As outlined above, the predefined account assignment references are used if otherwise no suitable rule can be found and applied in the SAP S/4HANA Cloud system.