Lawyers for the Perth Lord Mayor say they have advised her not to release any documents relating to a Corruption and Crime Commission (CCC) investigation while another inquiry is underway.

The CCC made findings of serious misconduct against Lisa Scaffidi for failing to declare thousands of dollars worth of free travel, including a $US36,000 ($50,000) trip to the Beijing Olympics paid for by BHP Billiton.

She was also criticised for not declaring BHP's gift of a hospitality package for the 2009 Leeuwin Concert and for accepting $1,093 worth of accommodation in Broome in 2008 from property company Hawaiian Investments.

On Monday, Ms Scaffidi pledged to release information she said would clear her of the CCC's allegation she deliberately tried to conceal the Beijing trip.

However she later backed down, saying she had been advised she could be in breach of the CCC Act.

In response, CCC Commissioner John McKechnie wrote to Ms Scaffidi's lawyers, formally lifting any restrictions on her discussing her evidence.

Her lawyers now say they have advised her not to release anything while the Department of Local Government looks into the matter.

The department has the power to prosecute or take disciplinary action if the Local Government Act was breached.

Earlier this week, Local Government Minister Tony Simpson said he hoped the inquiry would be completed in the next few weeks.

Voter backlash

Ms Scaffidi is seeking a third term as Lord Mayor against challenger, City of Perth councillor Reece Harley.

About 23 per cent of votes have already been cast in the lead up to the election on October 17.

The WA Electoral Commission confirmed it had received a number of calls from people hoping to change their postal votes in light of the CCC report.

However the WAEC said it was advising voters it was not possible to do so.