Stock Variation Issue while posting

Hi,

Since you're seeing postings to the Stock Variance account during the GRN/Product Receipt, I'd first check whether Fixed receipt price is enabled on the Item Model Group assigned to the item. Even when the inventory model is FIFO, this setting can cause differences between the receipt value and the inventory value to be posted to a variance account.

I'd also review the accounting entries and Inventory Posting setup to see which posting type is driving the Stock Variance transaction. The offset account and posting type usually make the root cause much easier to identify.