This is a very good issue that you raised. All the new applicants will face this problem and maybe even the old applicants who are going to reapply or add their spouse with their application will have to enter their National ID number, issue and expiry dates. This is what you can do:
1. First of all try to get confirmation from Election Commission Secretariat in Sher-E-Bangla Nagar, about its real expiry date. You can also check with National ID office that you mentioned. There is a very helpful member here, 'deba_avik' you can try talking to him as he has contact with UNDP and they are working with Election Commission. So he might be of great help. Debasis vai, if you're reading this, please help this new member with his problem. This is a big problem for new and future applicants. So, kindly share your inputs about expiry date and how to get a letter/statement about the expiry from respective office.
2. Previously, a high senior member by the username of 'Baloo', solved a similar problem for a Vietnamese applicant. He suggested that, the expiry date be set as far as possible say, 20 years, 30 years whatever you feel like and then with the attested copy of your National ID you can attach an additional page, saying that you don't know the expiry/expiry date is not available on the card and then state the reason you provided the expiry date was just so you can 'Validate' the form and get the bar codes. The VO will be understanding enough and not consider this as misrepresentation. If there is NO expiry then you've got nothing to do. Just give an explanation with the accompanying National ID copy. But first find out whether there IS or ISN'T any expiry date!
Stay in touch.
BR
munnabd
