Data preview error in CDS view 'C_MaterialStockActual'

I try to activate CDS view 'C_MaterialStockActual' in HANA Studio.

When I confirm data in data preview (right click > Open With > Data Preview), parameter value is required about 'P_LANGUAGE'.

I want to type value like "JA" or "EN", but error message "Enter a valid value; P_Language value cannot exceed more than the specified limit of 1." is displayed (see Capture).
As a result, I can't acquire data and no data is displayed in data preview.

Please give me advice to void this error.

Regards.

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Capture: Screen shot about 'Enter Parameter Values'