How is the currency of a roll-up summary field determined in a multi-currency organization?

In a multi-currency organization, roll-up summary fields calculate values based on the currencies of the related records. When a roll-up summary field sums up amounts from child records, it converts all values into the currency of the master record, which in this case is the Campaign's currency. This ensures that the final sum is consistently represented in the same currency, maintaining clarity and accuracy within the reports and user interface.

Choosing the Campaign's currency allows users to easily understand and interpret financial data, especially when different currencies might otherwise create confusion or complications in reporting. Therefore, the statement that values are converted into the Campaign's currency for the sum accurately describes how roll-up summary fields operate in a multi-currency environment, ensuring that the data is both meaningful and useful for analysis.