I am wondering if there is a way to check for duplicate values in a Sub-Form that would prevent users from submitting the main form?
For example, I haves a simple sub-form with one drop-down field that contains employee names. When the user is selecting the names in the sub-form, I don't want to let them pick the same name twice as shown here:
Is there any way through rules, either on the sub-form field itself or using a "before submit" rule, to display an error to the user letting them know that they have selected a duplicate value in the sub-form?
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