Thanks for the screenshot given and noted on your query below.
For your information, this error is caused by the calendar period is being set to 201612 in the Code Maintenance - Financials/GL - Calendar.
In meantime, we have proceeded to assist you in adding in the calendar period for year 2017. Kindly advise users to exit the debtors / creditors or accounting modules they are using currently to reflect on the new changes made.
In future, if this error occur again, you can resolved by inserting calendar period for following year 2018. Attached herewith [Example of Steps in creating new calendar period for year 2018.doc] for your reference.
Hope the document above is of help to you.
Please let us know if you need further assistance on this support ticket.
Regards,
Vivian