How "Currency_t" attribute gets its value in CPQ

Summary:

For quote currency in CPQ we see the currency is saved in attribute "currency_quote" but it only fetches the value "_system_current_document_currency_pref" which we saw there's no link or there's nothing related to it is present in CPQ , but from further investigation we came to know the currency value is coming from managed packages and from the attribut "currency_t".

So we need to understand how is this attribute is fetching the value of currency and sending to the quote currency .

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