Pick when the rule applies (conditions), then what must be true (requirements). When conditions match but a requirement fails, a validation issue is raised and export may be blocked.
Start from a template
Blocks CSV export until fixed.
When… (conditions)
ALL must match for the rule to fire. Leave empty to apply to every Invoice.
No conditions — the rule applies to every Invoice.
Then require… (requirements)
ALL must hold once the rule fires. A failure raises a validation issue.
No requirements — the rule fires but never raises an issue.