LSMW -Recording Index issue

Hi,

I was trying to add partners to a customer through XD02.

I need to add multiple Partners to a customer.

I recorded transaction but I have index issue .

For example when I recorded it is 6th line where i need to enter but for next record it should add in 7th line.

but 6th line is getting repalced.. how do i resolve this issue?

Should I code something in FIELDMAPPING?

Regards

Prasad