Ssis-661 Official

Understanding SSIS-661: A Comprehensive Guide

1. What SSIS‑661 actually is
2. How to reproduce it
3. Why it happens (the technical root cause)
4. Work‑arounds you can apply today
5. The official Microsoft fix (KB‑xxxxxx) and future‑proofing tips

• Execute the package in Debug mode (F5) and watch the Progress window.
• The error should disappear; verify that data flows as expected and that row counts match expectations.

Possible Causes:

Based on Microsoft documentation and community feedback, here are some common causes of the SSIS-661 error:

7️⃣️ 7.2. Deploying via Azure DevOps

or GitHub Actions

Automated Unit Tests

Solution 2: Check for Typographical Errors

Scenario

: A nightly load package DW_Load.dtsx fails at 02:15 AM with SSIS‑661 for the component OLE DB Source [Customer] complaining about column CustomerStatus . SSIS-661