Running-Total Fields, in my experience, only work in the footer sections.
You will need to create a manual running total.
Add a formula field to the Details section that populates a Global variable with whatever you are trying to capture. Something like:
//use WhileReadingRecords if the values can be gathered as the report pulls in values from the database. Otherwise, use WhilePrintingRecords.
WhileReadingRecords;
Global Stringvar CurrentVers;
//logic here to capture what you want
CurrentVers:=...
Add another formula field to the Header section. Add these two lines to it:
WhilePrintingRecords;
Global Stringvar CurrentVers;
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