Crystal report 2011 - Suppress formula?

Question

I'm not new to Crystal reports 2011, but I am new to this forum. Excuse me if my question is already answered in another discussion thread, but I've searched the forum, but could not find an answer easily.
In my report I need to total the amount per day per security. If one of the totals per day have a negative amount, my report should show all dates for that security.
To make it more clear to you I've put in two examples
Example 1:
From date      PfGrp        Por         Security      ISIN          Custody     Amount
15-1-2015      aaa           por_a      Sec01        123456      Cust01      5000
15-1-2015      aaa           por_b      Sec01        123456      Cust02      -6000
16-1-2015      aaa           por_a      Sec01        123456      Cust01       5000
16-1-2015      aaa           por_b      Sec01        123456      Cust02       1000
17-1-2015      aaa           por_a      Sec01        123456      Cust01       2000
17-1-2015      aaa           por_b      Sec01        123456      Cust02       1000
Expected output:
From date      PfGrp        Por         Security      ISIN          Custody     Amount
15-1-2015      aaa                          Sec01        123456                         -1000
16-1-2015      aaa                          Sec01        123456                          6000
17-1-2015      aaa                          Sec01        123456                          3000
Output expected because the total amount on 15-1-2015 is negative. Because of this negative total amount the other dates have to be shown as well.(although they are positive)
Example 2:
From date      PfGrp        Por         Security      ISIN          Custody     Amount
15-1-2015      aaa           por_a      Sec01        123456      Cust01       5000
15-1-2015      aaa           por_b      Sec01        123456      Cust02       6000
16-1-2015      aaa           por_a      Sec01        123456      Cust01       5000
16-1-2015      aaa           por_b      Sec01        123456      Cust02       1000
17-1-2015      aaa           por_a      Sec01        123456      Cust01       2000
17-1-2015      aaa           por_b      Sec01        123456      Cust02      -1000
No output expected because all the totals per day are positive.
Regards, Peter.

Answer 1

Hi Peter,
Try this please:
1) Save the existing report with a new name. You should now have two copies of the same report - let's call them A and B.
2) Open Report A.
3) Insert a Group on the Security Field first and then on the Date field. Set the Date Field to 'Print for Each Day'.
4) Create a formula (@Groups) with this code and place this on Group Header #2:
WhilePrintingRecords;
stringvar groups;
If Sum ({Amount}, {Date}) < 0 then
    If Instr(groups,{Security}) = 0 then   
        groups := groups + {Security} + ",";   
groups;
5) Suppress all sections of this report except the Report Footer.
6) Go ahead and Insert a Subreport. In the Insert Subreport dialog box, browse to the Report B and place it on the Report Footer.
7) Edit the Subreport so that it has the same groups as the Main Report (or Report A)
8) Right-click the Subreport > Change Subreport Links > Move the @Groups formula to the Pane on the right > Uncheck the option 'Select data in Subreport based on Field' > Click OK.
9) Get inside the Subreport > Click the Report Option > Selection Formulas > Record and use this code:
Not({Security} IN Split({?Pm-@Groups},","))
IF you have some existing selection formula in there, then you would need to add this condition with an AND clause.
Hope this helps.
The reason we have to add a Subreport is because you're trying to suppress a higher group based on a summary that appears on a lower group.
If you're reporting off of tables, you should be able to use a SQL Expression Field to display the summary for Group #2 and use this summary to suppress the higher section based on another logic!
-Abhilash