To obtain a judgment recognizing his ownership of immovable property or real right therein, the plaintiff in a petitory action shall:
(1) Prove that he has acquired ownership from a previous owner or by acquisitive prescription, if the court finds that the defendant is in possession thereof; or
(2) Prove a better title thereto than the defendant, if the court finds that the latter is not in possession thereof.
When the titles of the parties are traced to a common author, he is presumed to be the previous owner.
Amended by Acts 1981, No. 256, §1.