Accounting Settings - Control Accounts
View - Settings - Accounting
- Accounting Settings - Control Accounts 
Several of the Mamut modules post journals automatically in the Nominal ledger of the accounts. The control accounts determine the accounts used for such entries.
From the Account group drop-down list you can select an account group and view which N/C's are used by automatic entry from a corresponding module. You can also click in the N/C column and override the account if necessary.
The various account groups indicate the following modules that generate automatic entries:
Invoice shows N/Cs that are used for automatic entry from the Sales and Invoicing Module.
Purchases shows N/Cs that are used for automatic entry from the Purchase Order Module.
Customer & Supplier Ledger shows N/Cs that are used for automatic entry from the Customer and Supplier Ledger.
VAT shows N/Cs that are used for automatic entry from VAT settlement (Period End).
Profit/Loss shows N/Cs that are used for the Transfer of preliminary Opening balance.
Read more about:
The Sales and Invoicing Module