How can I do to keep convertion rate amount from purshase receipt in Project asset

Summary:

How can I do to keep convertion rate amount from purshase receipt in Project asset, and when I going to transfer information the convertion rate amount does not going to change for the In service date convertion rate from the addition?

Content (required):

How can I do to keep convertion rate amount from purshase receipt in Project asset, and when I going to transfer information the convertion rate amount does not going to change for the In service date convertion rate from the addition?

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