It is something that is very common in Qatar. It happens because of the government policy of issuing visas of only certain categories to a country at certain periods of time. As such, the visa allotted to your company was not that of the category of engineer. So, you may come across a Chef working under a sweeper visa. The only time it will affect you is when you go for a driving license. There are some categories of visa where driving license is not allowed such as that of barbers, janitors, cooks etc. However, I believe you can have the profession in your RP changed later on by submitting copies of your legalized education certificates to the authorities. Discuss this with your employer and he may be able to help you out.