The order was issued on March 28, which was the last date of admission from the waiting list, after Nazia Zaman, a waiting-list candidate bearing roll No. 405862, submitted a written complaint against the department admission committee about irregularities in the lists.

Abu Bakar Siddique, secretary of central admission committee, confirmed the issuance of the order.

"We have asked the department to explain the incident," he added.

The departments usually prepare merit and waiting lists from the primary list after taking viva-voce examination of the students.

A student can be excluded from the primary list if he remains absent or turns unqualified in viva-voce examination. But the serial of primary list must be maintained.

In her complaint, Nazia alleged that one Munia Jahan bearing roll No. 409425, whose serial was 126 in primary list, was placed on the waiting list before her name. Nazia's serial was 116 in the primary list.

An investigation by this correspondent also found similar irregularities in merit and waiting lists.

Anika Raihan Tanwi bearing roll No. 405814 became 15th in the merit list though she was supposed to be at the 18th position in the waiting list.

Smriti Biswas with roll No. 405227 emerged first in the waiting list, but she ought to be placed at the 20th position in the merit list.

Similarly, Ashrafi Anwar bearing roll No. 405817 downgraded to 25th in the waiting list instead of 6th position, and Mithun Chakraborty with roll No. 406630 was upgraded to 39th in the waiting list while he was supposed to be at 56th position.

"The lists were made unanimously. Changes might occur if someone gives wrong information in admission forms," said Dr Md Mafizul Kabir, chairman of departmental admission committee.

Kabir was made chairman of the committee for the third time consecutively this year giving rise to the question about the transparency of the committee.

Confirming the receipt of order from the central admission committee, Prof Mohammad Mustafa Feroz, chairman of the department, said, "If the serial is violated, we cannot enrol students."