https://userapps.support.sap.com/sap/support/knowledge/en/3684614
3684614 - SUM DMO Error: "... is not from the same export as ...". | SAP Knowledge Base Article
You are performing SUM DMO with system move. An error occurred in phase "MAIN_SWITCH/SUBMOD_MIG_SWITCH_NEW/SUBMOD_MIG_SER_DOWNTIME_IMP/EU_CLONE_MIG_DT_IMP"....