Unable To Reserve Standard Purchase Order - Getting GL Access Set Error message

While approving the Purchase Order, the Purchase order moved to Pre-Approved Status.

Getting Unable to Reserve and the failure reason is given below.

Error Message: The access set <Ledger X> assigned to the system profile option GL: Data Access Set does not include read and write privileges for the ledger <Ledger X> and the balancing or management segment value. Please use the Data Access Sets window in General Ledger to include read and write privileges for the ledger and segment values or assign a different ledger access set to the system profile option

What needs to be done and What set up to be verified.