allocation v/s classification

non-current vs current; cost of sales vs distribution costs - are examples of classification. Allocation is an aspect of "accuracy, valuation and allocation" – it means for example that an aspect of valuation is say depreciation - that that is appropriately allocated. So depreciation is not necessarily expensed to profit of loss, if it is a production overhead (e,g, on factory plant) it should be allocated to the cost of inventory. You could try browsing to help you find answers quite quickly - e.g. if you put the following into your internet browser: acca aa allocation classification you should see immediately that there is an ACCA technical article https://www.accaglobal.com/gb/en/student/exam-support-resources/fundamentals-exams-study-resources/f8/technical-articles/assertions.html

It would be allocation if, as an overhead, it becomes part of the cost of another asset - inventory. (IAS 2 - production overheads are a component of cost).