If wrongly create Customer/Supplier in 2 account and had transactions, how can i merge it?

Solutions:

1) On Customer/Supplier Listing Screen > Click "Edit" > Click on "Merge Item".

2) Select Customer/Supplier that Merge From on "Item > Select Customer that Merge To on "Merge To".

3) Click "OK" > Click "Yes" to confirm Merge Customer/Supplier

4) Click "Refresh" button to refresh the screen.

5) Customer/Supplier is Merged.