Data Source, Category, Exchange & ECN, Symbol Name and Symbol Root are the mandatory properties.
In case the symbol was added [[<span style="color: red;">'''LINK'''</span> /101_Symbol_List.html name="1=12"; Operating_Symbol_List#Adding Symbol from Data Vendor Supplied List|from a list supplied by data vendor]]
all mandatory and most optional properties are already set according to data vendor requirements.
It is possible to modify propeties only after the symbol is [[Setting_Properties#Editing an existing symbol properties|already added]] to the symbol list.
In case the symbol was added [[<span style="color: red;">'''LINK'''</span> /101_Symbol_List.html name="1=11"; Operating_Symbol_List#Adding Symbols in Manual Mode|manually]] all mandatory (except '''Symbol Root''') and some optional properties are already set.