GL: Single calendar across multiple ledgers

Hi

We need to create a new ledger with multiple companies and legal entities and wanted to use our existing COA and Calendar.  The accounting setup allowed me to do this but when I came to enter a journal within General Ledger the period list of values was empty.  The security profiles for the responsibility were set to the new ledger.  Have I missed some set up or does the system not allow an existing calendar to be used.  I've since created a new ledger with a new calendar and these periods are visible however the use of an additional calendar