BAS rules

If a transaction has a tax code with a SynergyMeaning it will appear on the BAS.
The tax code on the general ledger account is the default on all transactions but can be changed at entry time if the tax code is not fixed, except:

• Debtor charges entries default to the general ledger code and tax treatment defined against the fee being posted. This can be overridden in the Debtor Charges Entry window. See Debtor Charges Entry (Next Year Process) in the Debtors manual.
• No payroll sourced transaction will have a tax code.
• In general ledger journals you can change anything.
• No new transaction can be dated prior to the last BAS date if the transaction has a tax code other than N.