MaxString() finds string values in the expression or field and returns the last text value in the text sort order.
This formula model has variables in it.
A variable is like a code you write to rename an expression. Like instead of saying 8x5 every time i call it $(vWorkingHours). Every time you see this variable, run it or call it, it would calculate 8x5.
Your expression is saying:
-Go to ObjID: CH1573
- Find the string values in $(Expresion1) and return the last text value in the text sort order
The problem is there is nothing for us to see. It would help if we saw something or you could tell us as to why you want to know what it means. Is it broken? Does it not produce any results? Are you to change it and what do you want to change it to.
With BI, usually our answers lie within our problems. My advice would be to focus on what the Problem is and to resolve it as there are many ways to get the same result. It does not have to be this formula/expression alone, we can always use other basic ways to calculate. it is either that or a sample workbook.