Invoice with discount payment terms is not picked by PPR

Hi All,

Configured payment terms 4% 10 NET 30, which means Net30, but paid within 10 days from invoice date, can avail 10% discount.

Created invoice with aforesaid payment term, say invoice date 26-AUG-2019.

Created PPR today (29-AUG-19) with pay through date 29-AUG-2019 (within ten days from invoice date to avail discount), but invoice is not picked by PPR.

Whereas if I create PPR for pay through date 26-SEP-19, which is net 30, then invoice appears.

Checked supplier site and pay date basis is 'Discount'. Paymen terms is also configured correctly.

Your inputs please, on why invoice is not picked for discount?