To define a dictionary of accounting accounts we must access to:
System → Economic aux. → Diccionary of Accounts.
Once we have entered, we will see the list of accounts that we have defined in the dictionary of accounting accounts. If you have not defined one, the list will be empty.
To add new accounting accounts to the dictionary we will press "New". If we want to modify an account already created, we will click 
. If we want to eliminate it we will press 
.
When we add an account, a window like the following will pop up:
As we see, we can enter the number of the new accounting account and the name that identifies it.