Shadow foreign secretary Hilary Benn has accused the SNP of making misleading claims to Parliament about moves to give 16 and 17-year-olds a vote in the EU referendum.
Labour said the nationalists initially claimed their proposed amendment to the EU Referendum Bill would give teenagers a say.
However, the party later clarified that it would also let EU nationals take part.
Mr Benn said: "Alex Salmond has clearly made an error in tabling an amendment that conflates young adults with EU citizens, as demonstrated by his correction to the notes that tell Parliament what the amendment is meant to do.
"Many MPs who support 16 and 17-year-olds voting do not agree out of principle on EU citizens deciding on the United Kingdom's future in Europe because they feel this is a decision for citizens of this country."
Labour said it was the only party tabling an amendment solely about 16 and 17-year-olds.
Mr Benn urged the SNP party to "do the right thing" by teenagers and back Labour's push.
An SNP spokesman declined to comment.
But an SNP source said that the Labour amendment did not include a mechanism to register 16 and 17=-year-olds, which was in the SNP's preferred wording.
The Commons is due to vote on the amendments later today.
On Tuesday the explanatory statement accompanying the SNP amendment described it as extending "the franchise in the referendum to 16 and 17-year-olds".
Yesterday that was updated to say that it "follows the Scottish independence referendum model for the franchise, which includes 16 and 17-year-olds and EU nationals".
Meanwhile, Liberal Democrat Scotland spokesperson Lord Stephen accused an SNP MP of falsely claiming that 'the Vow' called for the full devolution of tax and spending to Scotland.
During the Scotland Bill debate earlier this week Angus MacNeil told fellow MPs the document "included full fiscal autonomy."
Lord Stephen said that that was not true because the Vow, signed by the three pro-Union leaders before the independence referendum, specifically talked of pooling and sharing resources equitably across the UK.
Last night Mr MacNeil said: "The Vow the No parties made to the people of Scotland in the days leading up to the referendum stated that 'extensive' new powers would be delivered - and also highlighted that the Scottish Parliament would have powers to raise revenue and protect its budget. "Lord Nicol Stephen's ally in the No campaign - the Prime Minister - said on 10th September that if Scotland voted No all options would be possible - as close to federalism as possible was the clear impression, which Gordon Brown also specifically promised."
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules hereComments are closed on this article