What Is FIELD CUSTOM VALIDATION EXCEPTION?
The FIELD_CUSTOM_VALIDATION_EXCEPTION error occurs when a custom validation rule prevents a record from being saved in Salesforce.
Salesforce throws this error to protect data quality and enforce business rules, but for users and admins, it often appears suddenly and blocks everyday operations like record creation or updates.
Common Error Message
You’ll typically see something like:
FIELD_CUSTOM_VALIDATION_EXCEPTION: [Validation Rule Error Message]
The message shown depends on the custom validation rule’s error text.
Where This Error Commonly Appears
- While saving records manually
- During Flow updates
- Data Loader imports
- Integrations and API inserts
- Apex DML operations
Why FIELD_CUSTOM_VALIDATION_EXCEPTION Happens
1. Validation Rule Conditions Are Met
The most common cause.
If the rule logic evaluates to TRUE, Salesforce blocks the save.
Example:
- Required fields missing
- Incorrect field combinations
- Invalid status transitions
2. Flow or Automation Updates a Restricted Field
Flows often update fields that:
- Trigger validation rules
- Violate business logic unintentionally
3. Data Imports Ignore Business Context
Bulk operations don’t “think” like users:
- Missing conditional fields
- Incorrect picklist values
- Invalid date combinations
4. Validation Rules Not Scoped Properly
Rules may not exclude:
- System admins
- Integration users
- Specific record types
- Automation contexts
How to Fix FIELD_CUSTOM_VALIDATION_EXCEPTION
✅ Step 1: Identify the Triggering Validation Rule
Go to:
Setup → Object Manager → Validation Rules
- Check recently modified rules
- Match the error message text
- Review the rule formula carefully
✅ Step 2: Review the Error Message
A good validation error message should:
- Clearly explain what’s wrong
- Tell the user how to fix it
If unclear, improve it.
✅ Step 3: Test with Real Scenarios
Use:
- Different profiles
- Different record types
- Manual entry + automation
This helps catch unintended rule triggers.
✅ Step 4: Add Exceptions Where Needed
Common exclusions:
- System Administrator profile
- Integration users
- Specific automation processes
Example logic:
AND(
NOT($Profile.Name = “System Administrator”),
/* validation condition */
)
✅ Step 5: Fix Flow or Data Logic
If triggered by Flow:
- Add decision checks
- Populate required fields
- Reorder Flow elements
Best Practices for Validation Rules
- Keep rules simple and readable
- Avoid overlapping validation logic
- Clearly name validation rules
- Document why each rule exists
- Test rules before activating in production
Who Should Handle This Error?
🎯 Primary Role
Salesforce Admin
Admins manage:
- Validation rules
- Data integrity
- User experience
🤝 Secondary Role
- Salesforce Developer (if triggered via Apex or integrations)
Admin Quick Checklist
- ✔ Identify validation rule
- ✔ Review rule logic
- ✔ Improve error message
- ✔ Add necessary exceptions
- ✔ Test manually and via automation