A custom role should be restricted from using Custom as a Price Level on Items sublist when editing a Sales Order record.
Solution
- Customize Sales Order form to hide the Price Level column- Navigate to Customization > Forms > Transaction Forms
- Preferred Form: Click Customize/Edit
- Click Sublist Fields tab
- Price Level:- Show: Remove Checkmark
 
- Click Save
 
- Restrict Custom Role to use the Custom Form- Navigate to Setup > Users/Roles > Manage Roles
- Preferred Custom Role: Click Edit
- Click Forms tab
- Click Transaction subtab
- Preferred Form Name:- Enabled: Enter Checkmark
- Preferred: Enter Checkmark
- Restricted: Enter Checkmark
 
- Click Save