The return to supplier at periodic and perpetual

summary

I need to understand the behaviour of the return to supplier at periodic and perpetual

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I made a return to supplier transaction, and I noticed that it first hits the receipt accounting, then the item cost is re-averaged, and after that the return to supplier is processed. Why does it behave this way at cost accounting? I need to understand how this behavior works under both Perpetual Average Costing and Periodic Average Costing

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