Data Cells become invalid when Flow Processing Type is enabled

When the Flow Processing Type "Is Alternate Input Currency for All Accounts" is enabled on a Flow member (as shown below

Data Intersections become invalid for that Flow member and Foreign Currencies (USD, CAD).Entity BU_200 default currency is EUR.

Note that when this property is not enabled the foreign currency cells are valid.

My understanding is when this setting is enabled the foreign currency data cells should be enabled for data load or input. Appreciate any clarification on this.