Resolving “Column Validation” Errors during SharePoint Sync

A “Column Validation” error occurs during SharePoint and OneDrive synchronization when a file uploaded through the local sync client fails to satisfy custom validation formulas or mandatory constraints defined on the destination document library. When this happens, the OneDrive client halts the sync process, marks the file with a red error badge, and reports that the item contains validation issues.

Fast Fix

Open the document library in SharePoint Online via your web browser. Locate the flagged file, open the Details pane (the “i” icon in the top right), and fill in or correct the highlighted metadata fields. The desktop sync client cannot prompt you for required values; once you validate them on the web, synchronization will complete.

---

Diagnostic Snapshot

Indicator	Details
Error Message	“This item contains validation errors” or “The value does not fall within the expected range.”
Failure Location	Local OneDrive sync client engine (onedrive.exe) during file upload
Primary Root Cause	Custom column formulas or constraints configured at the SharePoint library level
Remediation Layer	End user (Web metadata entry) or SharePoint Admin (Formula adjustment)

---

Why Column Validation Breaks File Synchronization

SharePoint allows site owners to configure Column Validation using Excel-like logic to ensure data integrity. For example, an administrator might require that a ProjectCode column begins with the letters “PRJ-” or that a ReviewDate column contains a date later than today.

[Local File Saved] ──> OneDrive Client Tries to Sync ──> SharePoint Evaluates Rule:
                                                          =AND([ReviewDate] > TODAY())
                                                                     │
                                                      Fails Validation (No data supplied)
                                                                     │
                                                                     ▼
                                                          Local Sync Client Pauses

The Sync Breakdown: The OneDrive desktop client is designed to synchronize files passively in the background. It does not possess a user interface to display custom SharePoint metadata entry forms.

When you save or drag a new file into a synchronized folder on your computer:

1. The local file is written to your hard drive.
2. The sync engine attempts to push the file to SharePoint.
3. SharePoint runs the library’s column validation formulas against the upload.
4. Because the file was uploaded locally without metadata, the required fields are blank or violate the validation formula.
5. SharePoint rejects the transaction, leaving the file stranded in a local sync error state.

If the library is blocking uploads simply because a field is marked “Required” rather than having a complex formula, reference Resolving SharePoint “Missing Metadata” preventing File Upload.

---

Step-by-Step Resolution

1. Correct the Metadata Using SharePoint on the Web

The most direct way to resolve the immediate sync block is to supply the missing information through the SharePoint web interface.

1. Right-click the OneDrive cloud icon in your taskbar system tray and click View sync issues.
2. Click the link to open the destination folder online, or log in via browser and navigate to the library.
3. The uploaded file will usually appear in the library with a warning icon or in a temporary staging view labeled Files that need attention.
4. Select the file, then click the Open the details pane icon (ⓘ) in the upper right.
5. Scroll through the metadata properties. Required fields or failed validations will be highlighted in red with an error explanation.
6. Enter valid data that satisfies the criteria and click Save.
7. Return to your desktop. The OneDrive sync client will recognize the cloud metadata update and clear the red sync error badge.

If your desktop app continues to struggle after updating metadata online, verify that Auto-Save is not failing by checking How to Fix “Required Properties” preventing Office Auto-Save.

2. Audit the Library’s Column Validation Formulas

If you are a Site Owner or Administrator, check whether the validation formula was written with flawed logic that unintentionally blocks uploads.

1. In the SharePoint document library, click the Settings gear > Library settings > More library settings.
2. Under Columns, click the name of the column throwing validation errors.
3. Scroll down to the Column Validation section:
   • Review the Formula box.
   • Review the User message box.
4. Verify whether the formula accounts for blank/null values on newly drafted files. For example:
   • Problematic Formula: =[CompletionDate] > [StartDate] (Fails immediately if CompletionDate is left blank on upload).
   • Safe Formula: =OR(ISBLANK([CompletionDate]), [CompletionDate] > [StartDate])

Bad Formula:   =([Score] >= 50)                      <-- Rejects file if [Score] is empty
Fixed Formula: =OR(ISBLANK([Score]), [Score] >= 50)  <-- Allows local file sync, validates upon entry

3. Inspect Library-Level Validation (Cross-Column Rules)

SharePoint supports two levels of validation: single-column validation and whole-library validation. Whole-library validation allows comparisons between multiple columns and is frequently overlooked during troubleshooting.

1. Go to Library settings > More library settings.
2. Under the General Settings column, select Validation settings.
3. If a formula is present here, it governs the entire library.
4. Ensure the formula logic does not create an impossible condition for new files entering via the OneDrive sync client.

4. Handling Excel and Specialized Data Columns

If your library utilizes lookup columns that interface with complex external databases or Excel workbooks, sync engines will frequently flag type-mismatch validation errors. Refer to SharePoint “Look Up” Column Sync Errors in Excel for lookup-specific validation remediation.

---

Hidden Problem: Checkout Enforced Alongside Validation

If a document library enforces Column Validation while simultaneously requiring Check Out, the sync engine enters an unrecoverable loop.

When check-out is mandatory:

• SharePoint prevents any new file from being visible to other users until checked in.
• A file cannot be checked in until all validation rules pass.
• The OneDrive desktop client cannot check in files automatically.

This leaves your files stranded permanently on your machine until you visit the web interface. To correct this architecture, see How to Fix SharePoint “Checkout Required” Sync Blockers.