Critical NHS report by National Clinical Forum rewritten
13 November 2012 Last updated at 08:47 GMT
Wales' shadow health minister Darren Millar has demanded to know why an independent report criticising NHS changes in north Wales was rewritten after being submitted.
The National Clinical Forum (NCF) warned the Betsi Cadwaladr University Health Board (BCUHB) changes were "unsustainable" in the long term.
But this was retracted after Mary Burrows, head of BCUHB, intervened.
She said the NCF was asked to "clarify" specific proposals in the document.
But Mr Millar told BBC Wales the whole process has been undermined.