I use a report with grouping and would like to add a group subtotal on a column which is computed the following way:
=GetTitelGV([TypeOfInvestment];[QTY];[EINSTAND];[xMarkt]) -> name of the column is xTitelGV
at the end of each Subsection I would like to show the subtotal using =Sum([xTitelGV])
However, this does not work. I don't want to use =Sum(GetTitelGV([TypeOfInvestment];[QTY];[EINSTAND];[xMarkt])) as I am using external API calls which are pretty slow.
Thank you so much for any help. Best regards Michael