question about out_msg.Destination in MOESI_CMP_directory response message - gem5

Question

In MOESI_CMP_directory-L2cache.sm--the action of j_forwardGlobalRequestToLocalOwner, the "out_msg.Requestor" of the request message is filled in the machineID of that L2 cache, so it is the correct requestor.
While, to response that message in "MOESI_CMP_directory-L1cache.sm"--the action of "ee_sendDataExclusive" ,when in_msg.RequestorMachine == MachineType:L2Cache, why is the out_msg.Destination filled in "mapAddressToRange", instead of "in_msg.Requestor"? (I think it is the "out_msg.Requestor" value of the request message.)
L2 cache:
action(j_forwardGlobalRequestToLocalOwner, "j", desc="Forward external request to local owner") {
peek(requestNetwork_in, RequestMsg) {
enqueue( localRequestNetwork_out, RequestMsg, response_latency ) {
out_msg.addr := in_msg.addr;
out_msg.Type := in_msg.Type;
out_msg.Requestor := machineID;// the machineID of the request L2
out_msg.RequestorMachine := MachineType:L2Cache;
out_msg.Destination.add(getLocalOwner(cache_entry, in_msg.addr));
out_msg.Type := in_msg.Type;
out_msg.MessageSize := MessageSizeType:Forwarded_Control;
out_msg.Acks := 0 - 1;
}
}
}
L1 cache：
action(ee_sendDataExclusive, "\e", desc="Send data from cache to requestor, don't keep a shared copy") {
peek(requestNetwork_in, RequestMsg) {
assert(is_valid(cache_entry));
if (in_msg.RequestorMachine == MachineType:L2Cache) {
enqueue(responseNetwork_out, ResponseMsg, request_latency) {
out_msg.addr := address;
out_msg.Type := CoherenceResponseType:DATA_EXCLUSIVE;
out_msg.Sender := machineID;
out_msg.SenderMachine := MachineType:L1Cache;
out_msg.Destination.add(mapAddressToRange(address, MachineType:L2Cache,
l2_select_low_bit, l2_select_num_bits, intToID(0)));//why do not filled in "in_msg.Requestor"?
out_msg.DataBlk := cache_entry.DataBlk;
out_msg.Dirty := cache_entry.Dirty;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:Response_Data;
}
DPRINTF(RubySlicc, "Sending exclusive data to L2\n");
}
else {
enqueue(responseNetwork_out, ResponseMsg, request_latency) {
out_msg.addr := address;
out_msg.Type := CoherenceResponseType:DATA_EXCLUSIVE;
out_msg.Sender := machineID;
out_msg.SenderMachine := MachineType:L1Cache;
out_msg.Destination.add(in_msg.Requestor);
out_msg.DataBlk := cache_entry.DataBlk;
out_msg.Dirty := cache_entry.Dirty;
out_msg.Acks := in_msg.Acks;
out_msg.MessageSize := MessageSizeType:ResponseLocal_Data;
}
DPRINTF(RubySlicc, "Sending exclusive data to L1\n");
}
}
}