This Page will give you guide to settings for :
If Customer & Supplier in RETAILERP
or Brain Software is Same,
Please do this Settings :
Go to Utilities > Options > "Unchecked" Show Customer & Supplier Separately. Press Apply.
Make Sure that if you Unchecked this Setting, then All Customers & Suppliers accounts will be displayed in Sales & Purchase Screen.
Leger of These Accounts will be shown in Common.
Still you can Pay & Receive Payment from Quick Payment & Quick Receipt Screen Respectively.