Thanks for your update, Ivor and Williams, As per your update, i am able to split the amount in to two with same document number(1000= 600/- + 400/-).
I have enabled the system settings in such a way, that when i execute FPY1, if there is an credit item for the BP, System will be paying the amount of credit item automatically.
Here as i want to pay back only 400/- out of 1000/-. i have enabled block for 600/- manually and processed for 400/- through payment run.
Is there any way that i can remove the block i have updated for 600/- automatically after executing the payment run.
Thanks
Aditya