title: How to set sub-elements in an ISO8583 message request
body: <p>I have a requirement where I need to set some subelements in the private data field 127, specifically subfield 22 and 33. I am unsure of how to actually set the data of field 127 as it needs to contain a bitmap specifying which subfields are populated (in this case only subfield 22 and 33).I have looked through the documentation, but there is not much mention of setting up subfields. Can anyone please guide me on how to do this?</p>