INVALID FIELD NAME error: Conversions on keywords performance report

As the title states. I see the field 'Conversions' in the report reference but the API responds with:

    Type: ReportDefinitionError.INVALID_FIELD_NAME_FOR_REPORT Trigger: None Field Path: Conversions

Here's the query:

    SELECT Criteria, KeywordMatchType, Clicks, ConversionValue, Conversions FROM KEYWORDS_PERFORMANCE_REPORT WHERE Status = ENABLED

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