Crystal reports-get previous database field

I have a crystal report showing deal numbers and their corresponding cash flows. It looks something like this:

Deal no       Cash flow amount         Cash flow date
1                 5,555                             2006-03-01
1                 6,899                             2006-04-01
1                 5,000                             2006-04-03
2                 300                                2006-02-01
2                 55                                  2006-04-01
3                 428                                2006-01-01
3                 300                                2006-02-01

In the report I need to include an additonal field indicating on which date the previous cash flow of the deal took place, i.e. something like this:

Deal no       Cash flow amount         Cash flow date            Previous cash flow date
1                 5,555                             2006-03-01                        -
1                 6,899                             2006-04-01               2006-03-01  
1                 5,000                             2006-04-03               2006-04-01                
2                 300                                2006-02-01                       -
2                 55                                  2006-04-01               2006-02-01                      
3                 428                                2006-01-01                        -
3                 300                                2006-02-01               2006-01-01  

How do I "save" the previous cash flow date to appear as information in connection with the next cash flow?

Kind regards
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Create a formua like this and place it next to Cash Flow Date:

if not onfirstrecord and previous({table.dealno}) = {Orders.dealno} then

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i98petkuAuthor Commented:
You have really saved me some time there. Thanks! It works great!

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