The Commissioner protested the ERA's jurisdiction over the case, invoking sovereign and diplomatic immunity as set out the Vienna Convention on Diplomatic Relations.
In response, counsel for Komla argued that her job was of a commercial nature and did not relate to official functions, therefore immunity did not apply.
"She also contends that an investigation of her employment dispute poses no risk to the official functions of the High Commissioner or the High Commission or the sovereignty of the Republic of South Africa by way of disclosure of information or protocols protected by the Convention," the ERA decision says.
But the ERA agreed with counsel for the Commissioner, who submitted the employment relationship was "a private activity incidental to the daily life of a diplomat and was not outside her official functions".
"I have heard from Ms Komla on the preliminary issue of diplomatic immunity rather than on the substantive claims," said ERA member Trish MacKinnon. "However, on the basis that her claims have no prospect of success, given the High Commissioner's immunity, I am satisfied it is appropriate to dismiss her claims without further investigation."