1. SAP S/4HANA 2023 - Official Product Documentation: In the Implementation Guide (IMG)
the path Financial Accounting -> Financial Accounting Global Settings -> Ledgers -> Ledger -> Define Settings for Ledgers and Currency Types allows for this configuration. The documentation for this activity states: "These settings are company code-dependent. For each combination of ledger and company code
you define the currency types and the fiscal year variant to be used." This confirms the assignment is at the Ledger/Company Code level.
Source: SAP Help Portal
SAP S/4HANA 2023
Implementation Guide for R/3 Customizing (IMG).
2. SAP Learning - S4F01 Financial Accounting in SAP S/4HANA for SAP S/4HANA 2023: The courseware explains the concept of parallel ledgers and their configuration. In the unit on Organizational Units
the lesson on Ledgers explicitly shows the configuration screen (transaction FINSCLEDGER) where the Fiscal Year Variant is a key field assigned per Company Code and Ledger combination.
Source: SAP Learning Hub
Course S4F01
Unit 2: Organizational Units and Master Data
Lesson: Ledgers.
3. SAP Press - Financial Accounting with SAP S/4HANA: Business User Guide (2nd Edition): Chapter 3
Section 3.2.3 "Ledgers" discusses the ledger concept. It explains
"For each ledger
you can define company code-specific settings
such as the fiscal year variant and the posting period variant... This allows you to use a different fiscal year for a non-leading ledger than for the leading ledger." This confirms the assignment is at the ledger level and applicable to non-leading ledgers.
Source: Rheinwerk Publishing
SAP Press
"Financial Accounting with SAP S/4HANA: Business User Guide"
ISBN: 978-1-4932-2071-5
Chapter 3
Section 3.2.3.