Transitional arrangements, in place since Romania and Bulgaria joined the EU in 2007, will end on 1 January 2014.
Green MSP Robin Harper said his party was concerned that transitional arrangements to help affected communities may not be adequate.
Ms Sandbach also argued that the plan will have a disproportionate impact on different farm systems and therefore needs appropriate transitional arrangements.
The organisaton had already written to Home Secretary David Blunkett calling for an amnesty and transitional arrangements to save the taxpayer a homelessness bill.
BBC: Asylum seekers from new EU countries no longer get support
Transitional arrangements might have to be made to ease the discrepancy, but they could require the one thing that ministers strove to avoid in drawing up their plans: extra money.
He said there were already exemptions to the cap - such as families in receipt of Disability Living Allowance (DLA) and Working Tax Credit - and outlined "transitional arrangements" to minimise the impact.
Although economists have provided plenty of estimates of people's tax burdens and of government revenues under different tax systems, far too little thought has been given to exactly how such systems would be introduced and what the transitional arrangements might be.
Egypt and Israel agree that, in order to ensure a peaceful and orderly transfer of authority, and taking into account the security concerns of all the parties, there should be transitional arrangements for the West Bank and Gaza for a period not exceeding five years.
In any case, he concludes, the current arrangements are only a transitional system before members are given total control in 2004.
The reason is not that a House of Cronies is a good idea, but rather that an explicitly transitional arrangement looks necessary, given that so many other elements in Britain's constitutional arrangements are in flux Scottish, Welsh and Northern Irish parliaments, possible electoral reform, elected mayors, possible regional assemblies for England, and more.
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