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How to fix: Value '...' is not facet-valid with respect to pattern '[0-9]{4}' for type 'Last4SSNType'.

What happened?

The Employee ID field must contain exactly 4 numeric digits. Full SSNs (9 digits), partial SSNs (1-3 digits), or alphanumeric employee codes all trigger this error. Leading zeros are often stripped by Excel, turning '0123' into '123'.

The Zero-Tolerance Solution

XMLExpress auto-extracts the last 4 digits from any input format and preserves leading zeros — so '123-45-6789' becomes '6789' and '0123' stays as '0123'.

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