MSPs are due to consider a progress report over reforms to Scotland's police and fire services.
The country's eight existing police and fire services are being merged into new national forces to cover all of Scotland.
But there has been a power struggle over the governance of certain administrative functions in the new single police force.
Both Stephen House, the chief constable of the Police Service of Scotland, and Vic Emery, chairman of its scrutiny body the Scottish Police Authority, have sought legal advice over who controls police support staff under the terms of the Police and Fire Reform Act.
Last month, Justice Secretary Kenny MacAskill told MSPs that the two had almost resolved the issue, describing them as being "95% there".