of Section 2 of RA 2259, and Zamboanga City, which had been autonomously governed since its creation by virtue of Section 47 of its city charter (Commonwealth Act No. 39). By virtue of Section 30 of Batas Pambansa Bilang 881 (Omnibus Election Code of the Philippines), approved on December 3, 1985, provided that: "unless their respective charters provide otherwise, the electorate of component cities shall be entitled to vote in the election for provincial officials of the province of which it is a part." This provision therefore overrides the 1951 Supreme Court decision on Teves, et al. v. Commission on Elections by providing voters in component cities whose charters are silent on the matter of electing provincial officials the right to again participate in provincial elections. BP 881 therefore again enfranchised voters in the cities of Bais and Canlaon (Negros Oriental), and Ozamiz (Misamis Occidental). Despite the charter of the city of Cotabato being silent on the matter of electing provincial officials, the city was not legislated to be part of any of the successor provinces of the old undivided Cotabato province. Voters of the city therefore were still not eligible to vote in the provincial elections of either Maguindanao or North Cotabato and therefore remained independent from any province. 1987–1991 The period between ratification of the new Constitution (February 1987) and the effectivity of the Local Government Code of 1991 (January 1992) was one of transition. During this time, BP 51, BP 337 and BP 881 were still in force: the only legal classes of cities during this period were still "highly urbanized" and "component" cities. Altering the right of city residents to participate in provincial elections was once again exercised by the newly restored Congress in this period. A total of three cities were affected: Republic Acts No. 6641 (in 1987), 6726 (in 1989) and 6843 (in 1990), once again allowed the residents of Mandaue, Oroquieta and San Carlos to vote for provincial officials of Cebu, Misamis Occidental and Pangasinan respectively. Since BP 51—which only considered cities as being either "highly urbanized" or "component"—was still in force at the time, the changes were not considered as switching between legal categories, but rather a simple change within the "component city" classification that did not require a plebiscite. Note that the "independent component city" legal classification was only introduced through the Local Government Code in 1992. Under the same criteria