Check whether FI period opened or not

You can find this from the Current Settings (Environment menus) in FI.

For example :- Accounting ->Financial Accounting -> General Ledger -> Environment -> Current Settings
                       -> Open and Close Posting Periods.

SAP FICO Reference Books:
SAP Financial and Controlling Interview Questions, Certification and Configuration, Books

Goto SAP CO Tips:
SAP Controlling

Back to SAP FI Tips:
SAP FI (Financial Accounting) Configuration Hints and Tips

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SAP ABAP/4 Programming, Basis Administration, Configuration Hints and Tips

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