I have a content type that has 3 term reference fields,Respectively as A、b、C，user fill in A and B,by rules get A and B then action set date value to C,but only set a value,What can I do, can you help me?

{ "rules_juhe_xieru" : {
    "LABEL" : "\u805a\u5408\u5206\u7c7b\u81ea\u52a8\u5199\u5165",
    "PLUGIN" : "reaction rule",
    "OWNER" : "rules",
    "REQUIRES" : [ "rules" ],
    "ON" : { "node_insert--mfpf" : { "bundle" : "mfpf" } },
    "DO" : [
      { "data_set" : { "data" : [ "node:field-juhe-fenlei" ], "value" : [ "node:field-diqu" ] } }
    ]
  }
}