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ERROR_CHECKOUT_REQUIRED
The repository requires an explicit checkout before editing
ERROR_CHECKOUT_REQUIRED is a Win32 result associated with versioned or managed document repositories., diagnosis should begin with the exact API, target object, and operation that produced it rather than with the message text alone.
What the result means
The file must be checked out before the requested save or modification. The practical meaning depends on the caller and on whether the affected object is local, remote, removable, policy-managed, or handled asynchronously. Diagnostics for it should retain its symbolic name, numeric value, and the operation name together.
What to check
- Confirm that the target library enforces checkout.
- Perform checkout using the repository API under the same authenticated identity.
- Check whether the item is read-only because it is published, approved, or locked by policy.
- Retain local changes until checkout succeeds or the user chooses another destination.
Recommended handling
Do not repeatedly retry a normal file write. Complete the repository workflow first, then save and check in according to its versioning rules.
Developer notes
Code handling this result should capture the failing API, resolved path or device identity, requested access, process identity, and the first observed error. After a call that reports it, read GetLastError() immediately because later cleanup or logging can overwrite the value. Retry it only when the specific condition is documented as transient, using a bounded delay and cancellation support.
References
- Microsoft: System error codes relevant to ERROR_CHECKOUT_REQUIRED
- Microsoft: File management context for ERROR_CHECKOUT_REQUIRED
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