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fix: Power Query update fails with 0x800A03EC when Data Model is present#324

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sbroenne merged 1 commit intomainfromfix/power-query-data-model-update-error
Dec 17, 2025
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26 changes: 25 additions & 1 deletiondocs/COM-API-BEHAVIOR-FINDINGS.md
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Expand Up@@ -131,7 +131,31 @@ foreach (Connection in workbook.Connections)

**Implication:** `Unload` method in `PowerQueryCommands.Lifecycle.cs` needs to also remove Data Model connections.

### Scenario 12: Query Renaming
---

### Scenario 15: Data Model State Blocks Formula Updates (UNRESOLVED)

**FINDING: WorkbookQuery.Formula becomes read-only in certain workbook states**

**Error Code:** `0x800A03EC` (-2146827284) - "Application-defined or object-defined error"

**Symptoms:**
- `query.Formula = mCode` fails with 0x800A03EC on some workbooks
- Error affects ALL queries in the workbook, not just Data Model queries
- Error is workbook-specific - same queries work fine in fresh workbooks

**Attempted Solutions (Did NOT Work):**
1. **Save-and-retry**: Saving workbook before retry did NOT clear the error state
2. **Polly retry with backoff**: Error is NOT transient - retries don't help
3. **File location**: Copying file from OneDrive to local drive did NOT help

**Current Status:** Root cause unknown. The error appears to be related to internal Excel state that cannot be cleared programmatically via COM automation. Workaround: manually save and reopen the workbook in Excel UI.

**See:** GitHub Issue #323

---

### Scenario 16: Query Renaming

**FINDING: Renaming a query breaks the connection to the table**

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@@ -1,4 +1,3 @@
using Polly;
using Sbroenne.ExcelMcp.ComInterop;
using Sbroenne.ExcelMcp.ComInterop.Session;

Expand DownExpand Up@@ -203,11 +202,10 @@ public void Update(IExcelBatch batch, string queryName, string mCode, bool refre
if (existingQueryTable != null) break;
}

// STEP 3: Update the M code with retry for Data Model-connected queries
// The 0x800A03EC error can occur when updating queries loaded to Data Model
// See GitHub Issue #316 for details
ResiliencePipeline pipeline = ResiliencePipelines.CreatePowerQueryPipeline();
pipeline.Execute(() => query.Formula = mCode);
// STEP 3: Update the M code
// Note: 0x800A03EC error can occur in certain workbook states (see Issue #323)
// Retry doesn't help - it's a workbook state issue, not transient
query.Formula = mCode;

// STEP 4: Refresh if requested
if (refresh)
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