Crystal Reports 2016 Sum field on two groups - crystal-reports

Question

I have a report that sums data and I am trying to modify it. I am trying to break out the totals by week by machine instead of one grand total by machine. Example of the calculations look like the following:
numberVar x := Sum ({WorkCntrSummary.Downtime_DurationInMinutes_Category0}, {WorkCntrSummary.Criteria_MachineID});
numberVar xh := Truncate(Round(x)/60);
numberVar xm := Round(x) mod 60;
if xh >= 1 then
ToText (xh, 0) + "h " + ToText (xm, 0) + "m"
else
ToText (xm, 0) + "m"
I am trying to change the 1st line where it is summing the field by MachineID. I want to sum it on the MachineID and also on a different group I added to the report which is a date field grouped by week. I am at a loss as to how to change that sum to add the date field by week to it. I tried changing it to the following, which doesn't do anything with grouping by week.
numberVar x := Sum ({WorkCntrSummary.Downtime_DurationInMinutes_Category0}, {WorkCntrSummary.Criteria_MachineID},{WorkCntrSummary.Criteria_StartDateTime});
numberVar xh := Truncate(Round(x)/60);
numberVar xm := Round(x) mod 60;
if xh >= 1 then
ToText (xh, 0) + "h " + ToText (xm, 0) + "m"
else
ToText (xm, 0) + "m"
But I get an error group condition must be a string.
Any help would be much appreciated.
Thanks!

Answer 1

Change
Sum ({WorkCntrSummary.Downtime_DurationInMinutes_Category0}, {WorkCntrSummary.Criteria_MachineID},{WorkCntrSummary.Criteria_StartDateTime})
to
Sum ({WorkCntrSummary.Downtime_DurationInMinutes_Category0}, {WorkCntrSummary.Criteria_StartDateTime})
In Crystal, the 2nd argument is what you group on. No need to chain all the grouping elements.