You are attempting to create an amortization or revenue recognition schedule outside the range of available accounting periods. Please adjust the periods on this transaction or go to Setup>Accounting>Manage Accounting Periods to set up more periods. But All period are created and tax period too

AI generated answer (using internal Slack threads):

Based on the conversations, it seems like you are encountering an issue with the amortization or revenue recognition schedule due to the range of available accounting periods. In NetSuite, all the periods that you will be amortizing TO have to be open. For example, if your amortization period is for 10 years, you have to have all of the next 10 years open in order to set up the amortization schedule. If you are getting an error like "The accounting period range Last Fiscal Year has not been defined", it doesn't necessarily mean you have to rename the period to "Last Fiscal Year". It could be that you have not created individual periods. If you are trying to create an accounting period that goes far into the future (like 2061) and you are getting an error like "Illegal year format", it might be due to the fact that NetSuite has limitations on how far into the future you can create accounting periods. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******