If you use the features in the Sales & Receivables application area, you must create links to the G/L accounts. The links are created by setting up one or more customer posting groups. You can use the same G/L account numbers or different account numbers for each posting group.
You must set up the necessary accounts in the Chart of Accounts window before you set up posting groups.
Open the 
Customer Posting
Groups window.
In the Customer Posting Groups window, fill in the various fields. For Help about a specific field, click the field and press F1.
Repeat this procedure for each posting group you want to set up. You can set up as many posting groups as you need.
Assigning Posting Groups to Customers