Hi Sam,
When the company profile in Adagio JobCost is opened, there is no option to enable MultiCurrency. So fully functional multi-currency is not available in JobCost.
You are correct that Source currency amounts from other MC-enabled applications such as AP will get converted to Home Currency upon retrieval. After posting in AP and prior to retrieval into JC, you can use GridView to look at the retrieval file to see what AP writes there (this is just for interest only).
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Regards,
Softrak Tech Support