My question relates to the qualifiers in tick history. In the recent years, the qualifiers have a MMT_Class which helps to further classify the trade, e.g. 12 stands for continuous limit order book.
However, going back to e.g. 2013 these qualifiers do not have the MMT_Class and are less rich in information.
Now I was wondering if and how there is a way to classify these trades as, e.g. opening/ closing call, continuous limit order book etc.
Any support and hint is highly appreciated.
Attached a print of tick history showing the qualifier column for clarification.