MAV error occurs when the data is created in any release between 4.7 and 4.93. The error may also occur due to the following reasons:
● A voucher having a bank ledger say B1 was created and duplicated by enabling the option Use defaults for bank allocations in F12 Configuration .
● After reconciling the parent voucher, the duplicated voucher was altered by choosing a different bank ledger say B2 and the parent was deleted.
● Now, alter the duplicate voucher or create any voucher with the bank ledger B2
● Tally.ERP 9 throws an MAV error and crashes.
Tally.ERP 9 crashes if the data created in any of 4.7 till 4.93 releases and migrated to 5.0 till 5.3 releases.
Rewrite of data will solve the issue.