Duplication Pain In The Neck... Do U Have The Remedy

Hi Everyone,

I have posted this question twice but i did not get any promissing response that could made my day.

I have a Database with one table. The database has a two forms. One is called Header Form Having following fields:
ClassNo, RollNo, Grade, Name.
and the other form is DETAIL form having following fields:
Month, Year, Subjects, Percentage, Result

Now it works this way. The user first enters data to HEADER form and presses a button that saves the HEADER information to the table then it takes the user to DETAIL form which shows all the fields(Non Modified) from HEADER of the record entered most recently and DETAIL form fields. Basically the DETAIL form is comprised on main(HEADER) and subform(DETAIL).

Now my problem is that when i enter particulars to the HEADER Form and press the button to jump to DETAIL form it works fine. on DETAIL form when i add a record and move the cursor to the next record it also accepts all the data entered on DETAIL form. But when i look at the data stored in table it gives me duplicate entries. I have set the form DUPLICATE on a query which returns non duplicate values. If i enter one DETAIL Item it shows no duplication but when i add more that one record to DETAIL it shows min 2 records with same ClassNo.

Here how my table looks like
Record No 1: ClassNo, RollNo, Grade, Name.
01 10 9 john

Month, Year, Subjects, Percentage, Result
Nov 99 Maths 76 Pass

Record No 2: ClassNo, RollNo, Grade, Name.
01

Month, Year, Subjects, Percentage, Result
Mar 99 Chemistry 87 Pass

My form is not putting the Header data on any record after second. It only puts ClassNo field in each child record.
Please Help Me with this and thanks for your patience for reading my problem. I hope someone will give me a chance to say thanks.

Darno