Hi Khandelwal,
If you want to post the incremental condition then ref. flow type 10 will helps you.you can do assignment in config accordingly.
Even if you do config for ref flow type 20 also, it will not have any harm, when ever some change (Reduction in value) happens in the condition after postings then only it will trigger and updates the cash flow correctly according to the changes done.
Similarly it applies for incremental condition also.
Regards,
Rao