https://generalledger-gl.blogspot.com/2019/06/what-is-accounting-convention-in-4cs.html
The ledger is a basic concept in R12. The ledger replaces the 11i concept of a set of books. It represents an accounting representation for one or more legal entities or for a business need such as consolidation or management reporting.
1. Chart of accounts
2. Functional Currency
3. Accounting Calendar
4. Accounting Convention
Convention: Importing the journals from other modules (AP, AR, FA, CM) in to GL
Conventional method means Sub ledger Accounting method. Importing the journals from other Modules (AP, AR, FA, CM) in to General Ledger (GL). For that purpose we are using the 4th'C (Sub ledger accounting method)