I have a custom post type with a custom field that is of type "Post Reference".
I also then have a post form for adding a new item to the custom post and an edit post form for editing an existing custom post.
When I leave the post reference field blank everything works as expected. However, when I enter a value in the post reference field I get an error saying "Error Submitting Form". It does actually save the data though...
You can test this out at the following location: hidden link
play around with adding and editing and leaving the case worker field blank and then putting a value in it.
I have tried de-activating all plugins apart from toolset as well as changing the theme etc... I've tried remove required field check on the custom fields and it is still happening.
I'm happy to set you up access to the admin dashboard if need be? As previously discussed this is just a complete demo / proof of concept site so you can add dummy data to test it out.
Thank you and I must apologize for the delay in response as it was a long weekend.
I took a look at this and was able to verify, so what i'm doing right now is to get a copy of the site to work on locally here and see if the problem exists on a different server environment.
Our 2nd tier support investigated the issue and found that you had named your reference field and the CPT with the same exact slug.
What you can do is to try changing the post reference field's slug and then try again. It should be noted that it is recommended that you use a unique slug for each item you create and not to use duplicate slugs.