Grouping Issue

i am grouping one field(CustomerID) in Crystal Report 10 even though value(111) of that field(CustomerID) is repeating in entire row. for example

Output is coming this way

customer ID Product name
111 Key board
111 Mouse
111 Mother Board

Output is suppose to come this way

customer ID Product name
111 Key board
Mouse
Mother Board

Can anyone help me to figure out why the value of field is repeating in row even though i have put that field in Group Section???

Thank in AdvacneIs your output
Preview View
<GH>111
<D>111 Key board
<D>111 Mouse
<D>111 Mother Board

Design View
Group Header: Group #1 name
Details: <Customer_id><Product_name>

<GH> = Group Header <D> = Details

If so you left the <customer_ID> field in the Details section

Let me know if Im off.

Thanks