@Andreea *******
You read this, correct?
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-Tourist-Visa.html
It's saying for you to either (basically)
1. Have a letter from your employer OR;
2. Information about your company (if you own your own company),
All what you need to do is to call up the company you work for, and have them write up a letter saying you work for them, how many years you work for them, that you have permission for your holiday between dates X and Y, and to call them if there are questions.
Easy, I think.