You’ll see this error when trying to import time off and the policy has the following setting enabled: “Allow employees to request partial time off for multiple days”.

As this blocks request imports, you can overcome this challenge by temporarily disabling this setting while you make the import.
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Go to Time > Time Off Settings
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Click on the relevant policy
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Actions > Edit
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Within the 'Request' section, turn off the setting “Allow employees to request partial time off for multiple days.”
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Complete your import.
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Re-enable the setting once the import is done.