Hello, We have a customer that has decided to change their Fiscal periods this year. So this year they will be using a short year. 1/1/21 - 9/30/21. We have FIxed Assets setup and have run depreciation through 12/31/2020 (they used to be calendar year). I have closed the 2020 year and now would like to have my Corporate Book updated to use my new FISCAL year Calendar ID in GP. We are running GP 18.3.1200 (2020). When I go to the Book setup, the calendar ID field is greyed out and we cannot update it here. What am I missing? Thank you in advance, Sheila