This will be about the traceability of the approval. The standards and procedures used by an accredited lab are calibrated against a chain of standards that ca

This will be about the traceability of the approval. The standards and procedures used by an accredited lab are calibrated against a chain of standards that can ultimately be traced back to the body that maintains national measurement standards (eg. NIST in the US), thus guaranteeing the accuracy of the measurement Various countries, such as Korea and the US, have certified each other's standards, providing traceability between countries. In this case, the measurements performed by the lab located in China can't be traced to a standard recognised by Korea. This is important, as the whole object of the lab accreditation process is to provide traceability to the primary standard. There's not much option here apart from repeating the measurements in a traceable way, as one can't retrospectively make a measurement traceable. It could be argued that it's not so much a case of revoking an approval, but that due to the lack of traceability the approval never existed in the first place.