Defining G/L account, to pre dated checks in SAP Business One

In pre-dated checks of either customers or suppliers. When we issue the receipt to the customer, the general account 21311 is automatically associated with the customer's account. In payment, general account 2231 is associated with that of the supplier. So, at the end of the year, we can get the right amount per customer / supplier in pre-dated. The way it is is not possible through SAP, because everything is in a general account.