The History module still existed in older Isah versions, even though it had in fact become redundant. Almost all files and lines in Isah, such as production orders, sales orders, order lines, production order lines and purchase lines, can be assigned a 'History' status to indicate that the component has been completed. You can use presets to filter out completed sales and production files from the start forms of modules, so that they do not obscure any current files; costs and revenues are posted during finalization and other relevant processes.
Because of the availability of these features, the latest Isah version no longer has a History module.