There’s no history record for GST Tax Return but not allowed to amend transaction (Original transaction date was locked by non-taxable period.)

SCENARIO : 

There’s no history record for GST Tax Return but not allowed to amend transaction (Original transaction date was locked by non-taxable period.)

SOLUTION : 

1. Run script to check in Management tools

select * from SYSTEMDATA

where systemdatacode = 'OldGSTValidPostingDate'

or systemdatacode = 'GSTValidPostingDate'

*Result showing there’s some previous record

2. Run script to clear it

Delete from SYSTEMDATA

where systemdatacode = 'OldGSTValidPostingDate'

or systemdatacode = 'GSTValidPostingDate'

DONE 

Refer attachment for details