We are running Sage 100 Advanced ERP 2013 and we need to switch from Fiscal to Calendar Year. I have created a test company and done the initial steps to change the period end dates to the new calendar dates and then run Recalculate Account Balances. I have also changed the Base Inventory Periods On field to Calendar Months in the IM setup options and recalculated inventory. Where I'm stuck is AR/SO and AP/PO. The History tabs in Customer and Vendor inquiry have the Period Ending dates changed, but the values don't match up where they're supposed to. Is there another recalc utility that I don't know about to update the required tables for these screens? I've reached out to our Sage consultant, but I wanted to check here too to cover all bases.