Dear member,
Erroneous transfer of funds is a dereliction of duty. Most companies classify the 'dereliction of duties' as misconduct. To award the punishment for the misconduct of a grave nature, the company has to order a domestic enquiry. Has it been ordered? If not a domestic enquiry, then did the company issue a show-cause notice to you and your manager?
Nevertheless, your question is whether the company will extend your notice period. But what is the cause of this worry? Do you think that you will be awarded the extension of the notice period as punishment? This is unlikely. Even if you had declined to pay half of the erroneous amount as a penalty, this punishment could not have been given.
Please note that awarding punishment for misconduct and the extension of the notice period are two independent things. One does not have bearing on the other.
By the way, oversight during work is common across all industries. However, is the hundred per cent recovery of the losses incurred by the company legally tenable? Please check with the legal experts.
Thanks,
Dinesh Divekar