If your fiscal year and the calendar year are the same, you will need to create 2018 posting periods in SAP Business One before transactions can be made for the new year. After you’ve created a posting period and transactions have been posted to it, you cannot remove it.
To create 2018 posting periods follow the menu path in Administration to System Initialization, then to Posting Periods. Check to see if 2018 periods exist.
Select the New Period. The Dates fields, Start of the Fiscal Year, and Fiscal Year field will all fill in automatically.
Edit the Due Date field as the below example, or leave the fields as SAP has filled them in. When you extend the Due Date from that allows you to have a document due date that extends into 2019. To finalize, click Add.
Review your posting periods. You should now see 2018 in your list:
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