How to have different conversion rate for foreign Currency Invoices Tax amount- Payables

Summary:

In Payables, Foreign invoices are calculated based on conversion rate(Corporate) provided at header level for Invoices base amount and tax.

Is there a way to calculate only the calculated tax amount should follow different conversion rate (e.g. user rate). I understand there is a conversion rate type field at tax setup level under default and control. But it doesn't seems to be working.

Also is there a way to override the tax rate used for tax line in AP invoice line or distribution level?

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