Duplicate values Crystal Reports

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CrystalReports

I have a this this kind of report as below. In this case {ISSUES.HOURS_TO_BE_INVOICED} is grouped by {IS.NRO}. But in section 677, 678, 679 should first be value 1.00, cause I'm creating a chart out of those values. How should I modify this "@Formula".

if PreviousIsNull ({ISSUES.HOURS_TO_BE_INVOICED}) then cstr({ISSUES.HOURS_TO_BE_INVOICED}) else if {ISSUES.HOURS_TO_BE_INVOICED}=previous({ISSUES.HOURS_TO_BE_INVOICED}) then '0.00' else cstr({ISSUES.HOURS_TO_BE_INVOICED})

The field {ISSUES.HOURS_TO_BE_INVOICED} is creating duplicates so I cannot use it in Bar chart. Could someone give me a bit of advice.

{ISSUES.HOURS_TO_BE_INVOICED}
{IS.NRO}   ^      @formula
673        |      ^
   0     2.00    2.00
   0     2.00    0.00
   0     2.00    0.00
   90    2.00    0.00
   20    2.00    0.00
   30    2.00    0.00

674
   0     1.00    1.00
   30    1.00    0.00
   0     1.00    0.00
   0     1.00    0.00

677
   0     1.00    0.00  <-- Should be 1.00
   0     1.00    0.00
   0     1.00    0.00 

678
   0     1.00    0.00  <-- Should be 1.00
   0     1.00    0.00
   67    1.00    0.00
   0     1.00    0.00

679
   0     1.00    0.00  <-- Should be 1.00
   0     1.00    0.00
   0     1.00    0.00
   10    1.00    0.00
   0     1.00    0.00

680
   0     0.00    0.00
   0     0.00    0.00
   17    0.00    0.00
   0     0.00    0.00

681
   0     3.00    3.00
   0     3.00    0.00
   0     3.00    0.00
   18    3.00    0.00

Thank You!!!