Error no showing


I've created a form using Forms Designer Client 3.1.4.
On the form I included a Cross-site Lookup field.
The column property is set to Enforce unique values.

When submitting a new form and selecting an entry that already exists I'm not getting any error or notifications that the item already has been created. the form just reloads and I can submit/save.

Am I doing something wrong or is that not supported?

Thank you!

Hello @jaitsujin,

What SharePoint version are you using?

Just for the future, questions regarding Forms Designer and Cross-Site Lookup are better answered in the official Forms Designer forum here: Forms Designer Forum - Index page

Hi. Understood. I’ll keep that in mind.
We’re on SP2019.
Should i report my question there?

Hello @jaitsujin,

Handling the unique value error is not supported by Cross-Site Lookup.

As a workaround, you can create a single-line text field to store Cross-Site Lookup ID and enforce unique values for that field. Thus the message will be displayed on the form.

Got it. Thanks. I'll give that a try.