Cost Accounting is a module for reporting purposes. It looks like a separate module /ISV that is embedded to D365 FO. But it is one of the standard modules. It is often mixed up with Cost Management. Cost management is used for inventory transactions inquiries, revaluation/closing operations and item costing operations. In cost accounting module you are able to manage cost allocations within D365 or Ax 2012 or upload data from Excel. System operates the transactions to copy data from the GL module if it is an operational data from D365 and allocated the transactions due to the rules setup in the module. You can do versioning due to the allocation rule setups user do. There is a detailed documentation for this module in Microsoft docs. Which has wonderful examples in the documentation. The only think that is a bit confusing i...