The British broadcaster was found to have committed a "serious breach" of industry standards by not revealing that the voice of a programme about the Gaza conflict was the child of a Hamas official, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to truthfulness".
Ofcom has instructed the corporation to broadcast a evening statement about its conclusions.
"Given this constitutes a significant violation of our code, we are ordering the corporation to air a announcement of our findings against it on the BBC's second channel at 21:00, with a date to be confirmed," it said.
'Risk to Undermine Confidence'
The regulator's report said: "Our investigation determined that the programme's lack of disclosure that the voice's father occupied a position in the Hamas-run authority was significantly deceptive.
"It meant that the public did not have vital facts which may have been extremely pertinent to their judgment of the narrator and the information he presented.
"Credibility is at the core of the connection between a broadcaster and its public, especially for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to damage the significantly high levels of confidence that the public would have put in a documentary produced by the BBC about the conflict in Gaza."
The programme was pulled from the BBC's streaming service in February after the presenter's family links came to light, and in July an corporation's own inquiry concluded it breached the corporation's content policies on factual correctness.
A BBC spokesperson commented: "The authority's determination is in line with the results of the internal assessment, that there was a major oversight in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with Ofcom's decision in full. We will follow the directive as soon as the timing and wording are finalised."
