Any documentation on why Foreign Currency GL budget are stored under Entered currency type

Summary:

User has a USD ledger with USD as ledger currency.

User then import both EUR and USD currency GL budget using the template.

But when running the FRS report, it is found that for USD GL Budget, it is stored under Total currency type. But for EUR GL Budget, it is stored under Entered Currency Type

Any documentation of FRS shows the above behavior and cause?

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Version (include the version you are using, if applicable):

Fusion Applications 26A

Code Snippet (add any code snippets that support your topic, if applicable):