According to sources, there is no scaled down of marks for professional course. It was only meant for b.com students because they had huge junk of students.
P.S. The above info MAY or MAY NOT be completely true. It can also be rumor.
Get Answers to your Doubts/Queries related to BMS results in this link – Frequently Asked Questions (FAQs) Of TYBMS Sem 5 CBSGS Results 2013-14