Capitalization of foreign currency AP Invoices

If I have an AP Invoice in non-functional currency, the functional equivalent used is the exchange rate associated with the invoice.

This functional equivalent is taken to Projects as invoice relates to a capital project. It may be 6 months to a year before this expense is capitalised, although the rate used is always the originating invoice FX rate and not the FX rate at point of capitalization.

The Asset Value created in Assets should reflect the Asset Value on capitalization and not the value of the original invoice lines.

Does anyone have any suggestions to this?