Did you set the Fiscal Position on the Vendor or on the Purchase Order?
If it's set on your import vendors it will automatically be applied to POs for that vendor. Or you can set it manually for a PO (in the "Other Information" tab.
Did you set the Fiscal Position on the Vendor or on the Purchase Order?
If it's set on your import vendors it will automatically be applied to POs for that vendor. Or you can set it manually for a PO (in the "Other Information" tab.
From my testing, the Inventory Valuation posting does not inherit the Fiscal Position from the Purchase Order / Vendor Bill, and so the stock valuation account is not changed.
I don't think there is any configuration change you can make, but it might be possible to use an Automated Action to set the Fiscal Position on the inventory valuation posting from what is set up on the Vendor.
Maybe someone else can comment on whether it should - I'm not an accountant, but the stock valuation should probably be based on the product definition and not on who you purchase it from (and if the imported product is fundamentally different it should be a different product).
I have updated the title of your question.
The Vendor is recorded with each Journal Item related to the stock valuation account, so you can separate the values received from import vendors without needing to customize anything.
The Fiscal Position has no impact on Inventory Valuation, it is related to default taxes for Products, which are not part of the value of a product (so it can be claimed back) unless later landed (because it is non-recoverable).