Valuation Methods - foreign currency valuation

Hello

I am trying to understand the concept of different valuation methods. could you explain using examples please ?

Say for instance, a goods receipt is raised in USD for 100USD on 2 Jan 2009 and local currency is EUR. Exchange rate is 1EUR : 1,5USD. On 4 Jan 2009 invoice received at rate of 1EUR : 1,6USD.

What are the implications of the options lowest value principle, strict lowest value principle, always valuate and revalue for such a transaction?

tks