https://userapps.support.sap.com/sap/support/knowledge/en/2327416
2327416 - Error occurs during MTI_SAP_COM~TC~KMC~RF~UMMIG | SAP Knowledge Base Article
In the phase Run Source Online Migration step, you are getting the error below in the file MTI_SAP_COM~TC~KMC~RF~UMMIG~JMT_ONLINE_ENGINE_MC_XX.ERR. [TIMESTAMP]...