Basically after entering the transactions report will be taken to verify the transactions. In case if approval is needed it is approved after verifying the transactions. Once you are sure that the transactions are correct the same can be posted to GL. Once it is posted most of the informations for the posted transaction can not be modified in the subledger. In case of any wrong entry you need to follow the reversal procedure.
Practically the verification of transactions are done only during the initial stages after implementation. Once the system becomes stable it is not followed strictly.
Note : Make sure that GL period is open for the transaction GL date.