Jim,
I tried as you proposed. I created a variant and used the “HL7 Configurator” to modify field 00537 and segment OBX-5. In the “Field Length” edit control, I cannot enter a negative value. So, after setting field length to “0” and replacing the field in the OBX message, I resent the message: OBX-5 in the HL7 message is empty!
Am I doing something wrong? I use HL7 2.3.1 and Cloverleaf 5.2, if that matters.
Rainer