previos month value in Crystal Report

Hello

I have got a crystal report looking as follow

Grouplevel                             Revenue | Margin
GH1 Country        
GH2 Customer (drill)

The user selects a specific month as parameter.

So I now want to ad a column showing the revenue of last month.
I already managed to get this partially work, using shared variables. In the data selection i select the current month as well as the previous month and then I added a group "month". With the shared variables I pulled the last months values and displayed them at the country group for the current month. My problem comes with the drill functionality. If I drill down to the customer level, I loose the previous month value on the country group, which is logical to me because the drill creates a new SQL-query specifically for the current month. So there can be no value. I am looking for hours to find a solution for this, but could not find anything appropriate. Using additional data sources as described  in other solutions is not an option because I am working on Business-Views, which make this difficult.

I am looking forward to hearing from you
mschmitzAsked:
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mlmccCommented:
Try this idea.

Add 2 formulas
PreviousMonth
If {DateField} In LastFullMonth then
    {RevenueField}
else
     0

Similarly for the current month

You can then use those formulas to get your summaries for the country and you don't need to group by the date.

mlmcc
0
mschmitzAuthor Commented:
Yep, I had such an Idea as well,
but as my report gets bigger (more columns), I would need to create a formula for each column on each group level (otherwise the grouping will not be done on the server).
I will create reports like that using more than 10 columns, so this will result in much formulas which is not very good for maintenance.
Do you have any other ideas?
0
mlmccCommented:
The only other way I can think of would be to use a subreport to get the previous month data but not sure what happens when you drill in.

mlmcc
0

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mschmitzAuthor Commented:
Not what I was looking for but thanks for the help
0
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