Category: Troubleshooting

Can’t Select Records in Polymorphic Lookup? Here’s the Fix!

Polymorphic lookups (like Regarding in Dynamics 365) are great—until you can’t pick records from your custom table or even system tables like Users. Frustrating, right? Here’s a quick checklist to get you back on track:

1. Check Custom JavaScript 🚫

Custom JS might be blocking your lookup. Disable any scripts on the form and test again.

2. Confirm Table is in Your Model-Driven App ✅

Open your app in the Modern App Designer (with Admin access). Is your missing table listed under Tables? If not, add it!

3. Use Classic Designer if Needed 🕰️

If the modern designer won’t let you add that table, switch to the Classic App Designer and add it there.

Quick Recap

  • Polymorphic lookup dropdown depends on your app’s table list.
  • Custom JS can interfere—check first.
  • Missing tables? Add them using the app designer.