What you are talking about is Customer payment receipt. Which means, you sold goods worth 100 rupees, and customer pays this outstanding amount in installments.
Invoice is 100
Installment 1 is 90 rupees
Installment 2 is 10 rupees
The above process happens in FI. This can be achieved through Installment payment term.
Create payment term in OB08 (Click Installment payment option)
Then Go to OBB9, Click on new entries, enter payment term with Installment details
Then simulate a scenario
This will work