Hi, I had a quick look at configuring this on a lookup field, but it didn't seem to work too well. You would need to configure it on the text field for the lookup, which has an ID of 'fieldname_ledit'. And it seems when we do this JQuery adds an auto-complete
class to the field which CRM doesn't like and throws errors.
As it seems this may only work on Single line of Text fields, you may need to create another field which will handle the auto-complete functionality, and then once a value is selected have that populate into the actual lookup field.
Hope that helps
Paul
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