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https://help.tallysolutions.com/docs/td9rel54/faq/4003.html

Voucher-wise Security Control TDL not working with Tally.ERP 9

By default, the Line Company Users is set to Read Only in TDL for security reasons. Hence, to add a field to the default Line Company Users, we need to alter the default part Company Users to incorporate an additional Field locally to the Line Company Users for Voucherwise Security Control.

Consider the following code snippet:

[#Part: Company Users]

Local : Line : Company Users : Add : Fields : VTypeSecYesNo

With the above code snippet, the same result is achieved as in Tally 9.