Can I change the planning currency of planned resources in a budget line, forecast line, or financial project plan?

Yes.

When you change the planning currency of a planned resource in a budget line (using the Edit Budget page), forecast line (using the Edit Forecast page), or financial project plan (using the Manage Resources dialog box or the Edit Task Assignment Details dialog box for rate-based resources with actuals), the raw cost and burdened cost amounts are recalculated accordingly.

You can change the planning currency of planned resources on a financial project plan without having to delete and recreate the plan line. Once you set to baseline, the baseline currency is also updated accordingly.

Note: You can change the planning currency only if the version is enabled for planning in multiple currencies.