How could i add filed in GL Entry

i want to add field of number of transaction in gl entry.
how?

You can’t. GL entry should not be tampered with in any way. If you compromise, there may be a lot of trouble in the future. So we do not suggest to add anything in GL Entry, Payment Ledger Entry, and Stock Ledger Entry.

Otherwise you can add it using script.

how ?
i try to add like this
image
I want to add the financial transaction sequence number because I did not find it in the system
i try to find the last financial transaction sequence in gl entry and take its sequence and add one to new financial transaction sequence in gl entry