Hi Petrb, 
 Because you sent me this message: 
 "Hello, I'm Petrb. I wanted to let you know that I undid one of your recent contributions, such as the one you made with this edit to Template:User sandbox/doc, because it didn’t appear constructive to me. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Petrb (talk) " 
 Perhaps I did not submit the article properly?  This is my first article & I'm a little unsure of the process. 
 Regards,