From the Edit Function Parameter Details panel, you can define parameter details.
The Horse code from the selected subfile record is to be passed as an input parameter to the Display Racing results function and will be restricted to show only race entries for this horse. This is where you specify that Horse code is an input only, restrictor parameter.
Type R against Horse code.
Press Enter.
Note that the Usage for Horse code defaulted to I (Input only) and the parameter role changed to RST (restrictor).
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