Crystal Reports uses a parameter field mechanism for linking subreports to main reports.
When linking a main report field that is not a parameter field to a subreport field, the program:
The need for a parameter field is implied; it is called an "Implicit Link" situation.
At times, you may wish to use a linked parameter field in a subreport without using it as part of the selection formula for the subreport. For instance, you may want the main report to pass in a summary value that can be used in calculations by the subreport, or you may want the main report to pass in the title of the subreport.
When you link a field in the main report to a parameter field that you have created in the subreport, the program:
Specifying a link is called an "Explicit Link" situation.
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