Not able to set revenue line revenue currency from opty header using groovy

Summary:

Need to convert the Opportunity Revenue lines currency values based on the Currency change on the Opportunity header.

Content (please ensure you mask any confidential information):

CASE A: When the Profile option - MOO_REVN_ENABLE_MULTICURRENCY is NOT enabled and when we change the currency on the Opportunity header level, it does NOT convert the currency of the opty revenue (for e.g. USD to EUR) and revenue lines. Instead, the currency symbol just changes from USD to EUR for the header level and also all the revenue lines.

In the above SS, initially the revenue amount was $349 and when we changed the currency to EUR, then only the symbol changed and it's 349 EUROS but hasn't been converted. Same case for all the revenue lines.