The health minister has insisted it would have been "inappropriate" for her to be involved with an independent report on changes to the NHS.
Lesley Griffiths AM was responding to an urgent question raised by Conservative AM Darren Millar on the reconfiguration of the NHS on 13 November 2012.
Wales' shadow health minister demanded to know why an independent report criticising NHS changes in north Wales was rewritten after being submitted.
The National Clinical Forum warned the Betsi Cadwaladr University Health Board changes were "unsustainable" in the long term.
But this was retracted after Mary Burrows, head of BCUHB, intervened.
She said the forum was asked to "clarify" specific proposals in the document.
Mrs Griffiths said she would not be involved until the end of the process when definitive reports are ready.
"I haven't been party to the conversations and absolutely it would be not right for me to be party to any conversations at this time," she said.
"It would have been completely inappropriate for me to have intervened."
Mr Millar said the changes were made to the NCF report in full knowledge of Welsh government officials who act as observers to the forum.
"The result was a report which went from expressing serious concerns about the health board's proposals to expressing support.
"Do you agree with me that these revelations seriously undermine public confidence in the process of NHS service change?"
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