S.C. Code Ann. § 6-17-310: Existing rights shall not be impaired by chapter.

Nothing in this chapter shall be deemed in any way (a) to alter the terms of any agreements made with the holders of any outstanding notes, bonds or other obligations of the municipality, (b) to authorize the municipality to alter the terms of any such agreements or (c) to impair or to authorize the municipality to impair the rights and remedies of any creditors of the municipality.