Question! If I have a DTV, can I still apply to own a business in Thailand? Looking to setup a Thai Registered Company

Hi all, I am opening a Representative Office in Bangkok for my company. The registration of the business will be done soon and I will act as director. The company that is following the paperwork said that until few weeks ago I would not have needed Working Permit, but recently the law changed. The situation is not really clear and different sources give different version. until now I live and work in Vietnam ( I am Italian) and also the Thai Embassy here did not give clear feedback. I know that everything will be done by a lawyer, but I would like to know if any of this group encountered similar situation and how it went. Thanks all in advance.