Report error message Last Rolling 18 Periods > is not defined for this fiscal calendar. Go to 'Setup Accounting > Manage Accounting Periods>' and set up or assign the period you need.

AI generated answer (using internal Slack threads):

The error message "Last Rolling 18 Periods > is not defined for this fiscal calendar. Go to 'Setup > Accounting > Manage Accounting Periods' and set up or assign the period you need" indicates that the specific period you're trying to use is not defined in your fiscal calendar. To resolve this, you need to define the period in your fiscal calendar. Here are the steps to do so: 1. Navigate to 'Setup > Accounting > Manage Accounting Periods'. 2. Click on 'New Accounting Period'. 3. Fill in the necessary details such as Period Name, Start Date, and End Date. 4. Click on 'Save'. Please note that the period name should be unique and the dates should not overlap with any existing periods. In the case of multiple fiscal calendars, the base period has to be consistent across all fiscal calendars. If you're trying to create periods with differing dates between calendars, you might encounter errors as the system does not support this. If a period is locked and not shown in the posting period drop-down for most roles, but some roles show the locked period in the drop-down, it could be due to the 'Override Period Restrictions' permission. You can check this by navigating to 'Setup > Users/Roles > Manage Roles > [Select Role] > Permissions > Setup' and look for 'Override Period Restrictions'. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******