How to change the autogenerated ACK in Mirth

[jayteecollins]

Hello,

I'm new to mirth. I tried to search everywhere but I could not find the answer to my question. I'm trying to make a change for the basic first for testing before i go further. When ADT message is received, I would like to change the ACK response.

for simple change, I'm trying to replace MIRTH name in MSH header as DUMMY

MSH|^~&|MIRTH||VGHIS|VGHIS|20250715161140.690||ACK|20250715161140.690|D|2.3.1
MSA|AA|SDAEFCG4PU1S5V8

I did the following.

1. set response = NONE
2. under source tab --> Edit transformer, i added a javascript step.
   var msh = msg['MSH'];
   var controlId = (msh && msh['MSH.10'] && msh['MSH.10']['MSH.10.1']) ? msh['MSH.10']['MSH.10.1'].toString() : 'UNKNOWN';
   var timestamp = DateUtil.getCurrentDate('yyyyMMddHHmmss.SSS');

var msh = msg['MSH'];
var controlId = (msh && msh['MSH.10'] && msh['MSH.10']['MSH.10.1']) ? msh['MSH.10']['MSH.10.1'].toString() : 'UNKNOWN';
var timestamp = DateUtil.getCurrentDate('yyyyMMddHHmmss.SSS');

var ack =
'MSH|^~\&|DUMMY||VGHIS|VGHIS|' + timestamp + '||ACK|' + timestamp + '|D|2.3.1\r' +
'MSA|AA|' + controlId;

return ack;

3. step did not work
4. so i tried putting this in Destination and created new step and no luck.

Kindly advise on how to do it properly.

Thanks in advance!