Hi Rafat
It happens on 2.4.9 when you would go Sales => Inquiries and reports => Customer transaction Inquiry or Banking and General Ledger => Inquiries and Reports => Journal Inquiry. You cannot edit Supplier payments, do not know why not, but all the others that you would edit and then try and save again give the error that the reference number already exists.
Then you change the number to the next number, after that no auto number increase. You now have to go back to Setup => Company Setup => Transaction Reference and change the relevant Transaction Type Reference number for the auto increase to work again. Maybe some form of change to the Setup to change the auto number +1 on the one that you just changed, for the next number.
I do not know if it might be that in 2.4 the References have changed and I am still using the 2.3 type layout that was converted in 2.4.
PHP 7.4.14
MySQLi 5.5.5-10.3.27-MariaDB
Hope this will help.
