---
layout: rule
id: GORULE:0000043
title: "Check for valid combination of evidence code, with/from rules and GO_REF"
type: report
fail_mode: soft
status: implemented
contact: "go-quality@lists.stanford.edu"
---

Specific allowed combinations are defined in the https://github.com/geneontology/go-site/blob/master/metadata/eco-usage-constraints.yaml file.

Evidence code documentation is at: http://wiki.geneontology.org/index.php/Evidence_Code_Ontology_(ECO)