This incident is a common occurrence in SAP Business One. If you Main Menus disappears, Simply go to the top of your screen, click on Window, then click on Main Menu, and your main menu will appear.
(What is a license?) SAP Business One is based on a named user licensing model, meaning that each license is granted to a specific user name. a “named user” is an employee of a customer, a subsidiary, or a third-party business, who is authorized access to the licensed SAP Business One software.
(How many do I need) this answer simply depends on the number of users you have for your business. Business one ranges between 5-100 users and there are four License User Types for SAP Business One:
Limited Financial User= has access to all major Banking, Purchase and Financial functionality in Business One. Typical users include Controllers, Accountants, and Financial Analysts.
There are several sources online that will take you through the period/year end close for SAP Business One. SAP has released official documentation on this process. This also has a checklist found at the bottom of the document that can be helpful when going through the year-end closing process. It can be found via: https://help.sap.com/
Accounting software deals with your typical accounting transactions (payroll, accounts payable, accounts receivable, trial balances, billing, sales order, purchase order, general ledger, timesheet, expense, and electronic payment). ERP (Enterprise Resource Planning) is a management system that tracks all aspects of a business (tangible/intangible assets, materials, human resources, financial resources, etc). A way to look at ERP and Accounting software is ERP is the entire pizza, were accounting software is just a piece of the pie.
You open and close accounting periods in the General Ledger work center, Sets of Books and Assigned Companies view.
To be able to open or close an accounting period, the corresponding fiscal year needs to exist.
Fiscal Years are created in the General Ledger work center, Sets of Books and Assigned Companies view.