security acces for chart of account mapping not work correctly f

Hello expert,

we have 4 compagnies set in oracle that share the same chart of account for Primary ledger.

Each compagny have it owne GKL responsibilities.

We need that for each responsibility , we can access to only the mapping related to this company.

we have only one user who has acces to make change in the mapping; This user has acces to all GL responsibilities.

we tried to make the security access set to the chart of account , but it'S not work. Is is that becaus ethe User have acces to all the entities?

Thank you in advance