CALL_FUNCTION_NOT_FOUND dump occurs with Function module name which starts with /1LT/ during migration in LTMC.
SAP S/4HANA on-premise
/1LT/ Migration Cockpit, CX_SY_DYN_CALL_ILLEGAL_FUNC, Function module not found , KBA , CA-LT-MC , S4 Hana Migration Cockpit , CA-GTF-MIG , SAP S/4HANA Data Migration Cockpit Content (LTMC) , How To
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