Nothing contained in this Sub-part shall affect in any manner the authority of municipalities or police juries to issue certificates of indebtedness to pay their current expenses under the statutes now in force, or affect certificates or other evidences of indebtedness already issued by any municipality or parish and payable out of the revenues of future years, or affect in any manner the existing laws relating to parishes anticipating their revenues for future years.
La. R.S. § 2:225