Hi Drazen,
We have created the wpml-config.xml some time ago with the _alg_wc_cog_cost meta set up. It’s meant to be copied between translations, as the regular price is. This is our xml file:
<wpml-config>
<custom-fields>
<custom-field action="copy">_alg_wc_cog_cost</custom-field>
</custom-fields>
</wpml-config>
Our multicurrency section is more oriented to orders. For example, if you use a multicurrency plugin on your site and some customer purchases a product in a currency different than the shop base, our multicurrency section will convert the cost and profit values from the order to the shop base currency.
Our plugin expects the product costs to be registered with the base shop currency.