Dear Garg ji,
The name Barleria prattensis is taxonomically incorrect. It is named after some Mr. Pratt, but when you coin an epithet after someone's name, you should never end it as ensis. This ending of an epithet is used when the plant is being named after a place, e.g. yunnanensis, capensis, nilgherrensis etc.
The ending iana can be used when the epithet is named after a person, e.g., wightiana, hamiltoniana, wallichiana etc. It is against taxonomy rules to name an epithet after a person, and end it with ensis. That's why prattensis is incorrect.
For correcting such names, a separate paper is not required. The incorrect epithet can just be replaced by the taxonomically correct epithet. You can see that POWO mentions the exact same publication, Kew Bull. 3: 487 (1948 publ. 1949) , for both the names!
You may like to put the correct name, Barleria prattiana Santapau on eFI.
Tabish