The BBC was found to have committed a "serious breach" of broadcasting rules by failing to disclose that the voice of a documentary about Gaza was the offspring of a Hamas representative, according to regulatory body Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The head of the BBC had previously apologised, stating there had been "a major oversight in relation to truthfulness".
Ofcom has directed the BBC to broadcast a prime-time declaration about its decisions.
"As this represents a serious breach of our code, we are ordering the corporation to transmit a message of our conclusions against it on BBC2 at 9pm, with a timing to be determined," it said.
'Potential to Erode Confidence'
The authority's statement declared: "Our investigation concluded that the programme's omission to reveal that the presenter's father held a role in the Hamas-controlled authority was substantially inaccurate.
"It meant that the public did not have vital facts which may have been very significant to their assessment of the presenter and the information he provided.
"Confidence is at the heart of the bond between a broadcaster and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This failing had the risk to erode the exceptionally strong degrees of credibility that audiences would have placed in a BBC factual programme about the Gaza conflict."
The film was withdrawn from iPlayer in last February after the presenter's family links emerged, and in the month of July an corporation's own inquiry concluded it breached the corporation's journalistic standards on factual correctness.
A representative for the broadcaster commented: "The authority's determination is in agreement with the conclusions of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We have apologised for this and we accept Ofcom's decision in its entirety. We will follow the sanction as soon as the timing and language are determined."
