Update account in banking system

Question

i am working on a banking system
where i am implemting a trasfer value from on account to another and i am using oracle forms i wirte the following code in when-buuton-pressed trigger:
update account set bal=bal-:value where acc_no := :acc_no1;
update account set bal=bal+:value where acc_no := :acc_no2;
commit;
i want to insert values in a auditing table so where is the best place to write the code after doing the two updates or in a after insert trigger.
Thanks a lot

Answer 1

but my code look like thins
in the when-button-pressed trigger:
update account set bal=bal-:value where acc_no := :acc_no1;
update account set bal=bal+:value where acc_no := :acc_no2;
commit;
so if after the commit and before the post-update trigger is executed the databse went down so the when-button-pressed trigger is exuted but the post-update will not be executed