Article 6 3.

the tax payable in the Czech Republic, Greece, Spain, Latvia, Lithuania, Poland, Portugal or Slovakia, on such income on the basis of paragraph 1,

or

that part of the tax on the income of the company or permanent establishment which received the interest or royalties, as computed before the deduction is given, which is attributable to those payments under the domestic law of the Member State of which it is a company or in which the permanent establishment is situated.