Xi left India on Friday after a visit to boost trade and economic ties that have been marred by a long-standing border dispute.
The blooper occurred on a show on Doordarshan news on Wednesday.
"It is an unpardonable mistake," the official told Reuters on the condition of anonymity, saying the anchor was employed on a casual basis. "We have debarred her from news reading for a few months."
The official said a shortage of news readers had forced the channel to run some news bulletins with casuals.
The incident comes at a time when Doordarshan news is trying to reinvent itself to compete with private broadcasters. Its programmes are often a matter of public ridicule for their poor production quality.
The gaffe led to a wave of sarcastic comments on social media.
"The silver lining: at least the anchor knows Roman numerals," kanikagahlaut posted on Twitter.