Where accounts are defined for the lease accounts Oracle fusion cloud?

We are implementing lease accounting, the following error is generated: "Subledger accounting couldn't retrieve a value for the accounting flexfield
account rule. Details: The GL account can't be derived by account rule.
Review the account rule definition and the extract source values, if applicable,
for the event and ensure that a valid GL account can be derived for the
subledger journal entry", I can't find where to assign the accounting accounts, could you help me.

Thank you