Set up your business transaction terms (payment due dates) to match those in your accounting package.
Do Not Trade
If you set a client to 'Do Not Trade', you will see:
This is irrespective of the trading terms label/name.
To set a default transaction term that will be used for all new clients and suppliers:
Change transaction terms for a particular client
To change the transaction terms for a particular client:
To archive a transaction term that is no longer needed:
To bring an archived transaction term back into use: