Note: The original reported behavior is correct by design. Plans filter NADs by target project to ensure migrated VMs only use NADs in the target namespace. Network Map page shows all NADs because it has no specific target project.

This ticket tracks UI bugs fixed on the Mappings tab:
1. "Add mapping" button can be clicked when no more mappings are available (button disables but nothing happens)
2. When clicking Cancel after adding mappings, UI shows them as added until page refresh

Always 

Issue 1 - Add Mapping Button:
1. Go to Plan Mappings tab, click edit
2. Add all available mappings
3. Click "Add mapping" button again
4. Button becomes disabled but no action occurs

Issue 2 - Cancel Action:
1. Go to Plan Mappings tab, click edit  
2. Add new mappings
3. Click Cancel
4. UI shows mappings as added
5. Refresh page to see actual state

1. Add mapping button clickable when it shouldn't be
2. Cancel doesn't revert UI state properly

1. Add mapping button disabled when no more mappings available
2. Cancel immediately reverts UI to actual state