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Considering we have a KCF - Single select configured with one SIL Data Source, one Selection script, minimum characters for autocomplete set to 5 and the maximum results number set to 50. We want to select an issue using its key or summary. The custom field looks like this:
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The SIL data source used to populate the custom field above:
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It creates a link of type "Relates" between the current issue and the selected issue.