A BBC Editor publicly compared the union with England to an abusive relationship days before a closely-fought referendum on Scottish independence and as a programme about the vote presented by him was preparing to be transmitted, Wales Eye can reveal.
Corporation staff had to be reminded of internal guidelines soon afterwards.
A tweet by the corporation’s Welsh Affairs Editor, Vaughan Roderick, which was later deleted, said some unionists rejoiced in "threats and bullying".
The public message to all his 6,000 followers on the social media site, was soon re-tweeted by a conservative nationalist who writes under the pseudonym ‘Jac o’ the North’.
But a television show hosted by Mr Roderick and filmed mainly in Scotland was still transmitted by BBC Wales afterwards.
Very odd that people who claim to love ‘the union’ rejoice in threats and bullying. It sounds like an abusive relationship.
The tweet from Mr Roderick caused consternation within the BBC.
"It’s an appalling thing for a supposedly independent journalist to say", one broadcaster told Wales Eye.
"We are days away from a neck-and-neck referendum on Scottish independence and he is meant to be telling us about it.
"How are we to trust anything he says?"
The tweet was deleted soon afterwards as senior BBC management discussed the issue.
It comes after guidelines were supposedly tightened up by the corporation following several breaches in internal rules.
The Wales Millennium Centre (WMC) played host to Mr Roderick and others for a debate about independence.
His tweet was published two days before the event.
Mr Roderick was described as a "key figure", in the debate on the implications for Wales of the Scottish independence referendum, which was organised by the Institute of Welsh Affairs (IWA) UK’s Changing Union, and WMC.
Yesterday the head of BBC Wales news and current affairs, Mark O’Callaghan, was forced to remind staff of the importance of impartiality.
He sent them a link to the corporation’s guidelines about twitter.
In an internal email seen by Wales Eye, Mr O’Callaghan noted: "With the result in Scotland on a knife edge, the BBC’s commitment to impartiality will never be more closely scrutinised than at present.
"I’d like to remind staff that this scrutiny extends not only to our output but also to any personal views expressed on social media outlets.
"I’ve included a link to the full guidelines below, but in short the message is to use common sense and to ensure that nothing you say compromises your impartiality."
All BBC guidelines on neutrality were included in the official email, including social media rules: http://news.bbc.co.uk/1/shared/bsp/hi/pdfs/14_07_11_news_social_media_guidance.pdf.
Remarkably, last night a recorded 45 minute programme was transmitted about the referendum presented by Mr Roderick.
This came after the published, then deleted, tweet giving his views, senior management discussions about it within the BBC, and the re-issuance of guidelines reminding corporation staff of social media rules on impartiality.
The promotional material for the programme said: "Vaughan Roderick asks if Wales can find a vision and make its claim for a better future."
The controversy comes soon after a senior UK BBC Editor was reprimanded and removed from an election after she tweeted an anti-UKIP message before the European poll (see - tmblr.co/ZwCEOs1Gj-yEO ).
Jasmine Lawrence had tweeted sarcastically: "#WhyImVotingUkip – to stand up for white, middle class, middle aged men w sexist/racist views, totally under represented in politics today."
BBC personnel were then warned not to "do anything stupid."
The statement from Mr Roderick echoed the views of the Republican Communist Network who said: "Let’s all end our abusive relationship with the UK state."
But at least we know where he stands.