Dolibarr is a very good tool. It's used since many years and wen you found a problem the community and the team were very reactive to found the problem (if any) or to explain the miss understanding. Thanks to all (Team and forum users)
It was not possible to add a new client order. In addition I encountered several server errors including a page returning some font error (sic) and other errors including this TCPDF ERROR: Could not include font definition file: arialunicid0. Overall it seems they do not get the product to work on their own server. Too bad as it looked promising.