It's emerged the Mater Hospital has been paid almost five million euro in the last eight years to manage a pension fund that doesn't exist.
Accounts filed by the Central Remedial Clinic show it paid the Mater 4.91 million euro in the last eight years to manage a voluntary pension fund.
But the CRC's former chief executive says the pension fund has no value - and pensions are actually paid out of other sources.
Paul Kiely says he tried to bypass the arrangement with the Mater - but was told he couldn't do so.
It's not the first scandal the Central Remedial Clinic's found itself in recently.
The Dublin-based clinic has admitting topping-up the pay of some senior staff using money from fundraising.
The revelations have been made at a meeting in Leinster House on the salary top-up scandal.
The Dail's Public Accounts Committee says the HSE must take some responsibility.