failing Field type change
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failing Field type change
You’re attempting an incompatible field type change.
Problem Explanation
Salesforce restricts field conversions that risk data loss.
Root Cause(s)
1. Text → Number conversion
2. Lookup → Master-Detail change with existing data
3. Encrypted field changes
Step-by-Step Solution
1. Create a new field with desired type
2. Migrate data via Flow or Apex
3. Update references
4. Delete old field
Edge Cases & Variations
1. Managed package fields cannot be changed
2. Formula fields behave differently
Common Mistakes to Avoid
1. Forcing destructive changes
2. Ignoring dependencies