Sir Alan Budd, the first chairman of the Office for Budget Responsibility , said he believed the OBR had rebuked David Cameron because he "made an error'.
I think it could be regarded as something of a rebuke.
I think he is correcting a statement that the Prime Minister has made and the important thing is that the Prime Minister is attributing a view to the OBR which it doesn't hold and I think when that happens it is absolutely right to write to the Prime Minister and point out that he has made an error.
Sir Alan was talking to BBC Radio 4's PM program.
More top news
The Gurkha regiment of the British army have been part of the rescue and recovery effort following the Nepal earthquake.
Hilarious CCTV video shows punter fall to pub floor like famous Only Fools and Horses 'Del Boy' scene.
Gosling said his "heart goes out" to the family and friends of a man who created an internet meme around the star failing to eat his cereal.