The investigating officer (IO) of the case said further investigation, as directed by the court earlier, was underway and it was awaiting sanction to prosecute the other co-accused.
Special Judge Hemani Malhotra granted time to the probe agency and fixed the matter for further hearing on August 1.
Maliwal, who was earlier granted bail by the court in the matter, was also present at the hearing.
The court, however, had said the probe has not identified Maliwal's associates with whose connivance the alleged "illegal practices were adopted" and directed the police to probe their role and file a supplementary charge sheet.
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The first charge sheet was filed by ACB on December 21, 2016 against Maliwal in connection with the alleged irregularities in the appointment of AAP workers in DCW.
Singh, a former MLA, had filed the complaint against Maliwal and Delhi Chief Minister Arvind Kejriwal on August 11, 2016, alleging that many illegal practices were adopted by them to financially benefit aides and associates of the Aam Aadmi Party at the cost of public exchequer.
A case was lodged against Maliwal on September 19 last year for alleged offences of cheating and criminal breach of trust by public servant under IPC and provisions of Prevention of Corruption Act.
It was also found that the appointments were made without inviting any application by way of publication or constituting a selection board.
According to the prosecution, the probe revealed that the remuneration amount was hiked in a "whimsical manner", thereby granting undue pecuniary benefits to the close associates of Maliwal and those connected with AAP.