3SWithout prejudice to paragraphs 4 to 6 of this Schedule, a warrant issued before the commencement of Part VI of this Act, for the enforcement by diligence of an obligation to pay money, contained in an extract of a decree of the Court of Session or the sheriff court or of a document which has been registered in the Books of Council and Session or in sheriff court books shall be treated as if it were a warrant contained in such a decree granted after the commencement of that Part.