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How to Fix “A binary operator with incompatible types was detected” in Power Automate

Fixing Power Automate Error – A Binary Operator with Incompatible Types

When working with Power Automate, we often encounter errors that seem simple but can be quite confusing. One common error that many developers face when using List rows or filters in Power Automate is:

Error:
A binary operator with incompatible types was detected.

In this post, I’ll explain why this error happens and how you can fix it quickly so your flows run smoothly.

Why This Error Happens

This error usually appears when you are trying to apply a filter query in a List rows action and you are comparing two fields with incompatible types. For example:

  • Comparing a lookup field directly with a text value.
  • Comparing an integer field with a string.

In Dataverse, certain fields, like lookups, require you to use their GUID values in the filter. If the types don’t match, Power Automate throws the binary operator error.

How to Fix It Step by Step

Here’s how to solve it:

  1. Identify the field you want to filter and check its type in Dataverse.
  2. If it’s a lookup field, use the GUID value in the correct format: _logicalname_value eq 'GUID'.
  3. If it’s another type (string, integer, boolean), make sure your filter uses the same type.

Example for a lookup field:

_accountid_value eq '00000000-0000-0000-0000-000000000000'

This ensures that Power Automate can correctly interpret the filter and the flow runs without errors.

Tips to Avoid This Error in the Future

  • Always check the field type in Dataverse before applying filters.
  • Use GUID values for lookup comparisons.
  • Test your filter queries in the “Filter Query” box to verify they work before using them in production.
  • Remember: matching types is key. Strings with strings, integers with integers, GUIDs with GUIDs.

Conclusion

The error “A binary operator with incompatible types was detected” in Power Automate is common, especially when working with filters and List rows. Understanding the field types and using the correct format for comparisons will save you a lot of frustration.

Learning from these errors makes us better developers

Have you run into this error or others before? We’d love to hear about it in the comments!

For a related guide, check out my post on How to Fix "A binary operator with incompatible types was detected" in Power Automate.

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