Custums Invoice settlement aganist to PO

Hi All,

User created PO without customs condition in the conditions tab

For this PO GR is happend and Invoice also posted for the material vendor,

Know the issue is he got the Invoice from customs vendor,

How can we adjust this amount?( as per PO there is no customs vendor)

Is there any impact on inventory If we did the adjustments in FI side plese let me inform how it will impact on inventory.