# Referencing data type param in alarm custom subj expression

**URL:** <https://forum.inductiveautomation.com/t/referencing-data-type-param-in-alarm-custom-subj-expression/12254>\
**Category:** Ignition\
**Created:** [October 18, 2016, 5:47pm UTC](https://forum.inductiveautomation.com/t/referencing-data-type-param-in-alarm-custom-subj-expression/12254 "2016-10-18T17:47:00Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![zfellers](https://avatars.discourse-cdn.com/v4/letter/z/b19c9b/32.png) [@zfellers](https://forum.inductiveautomation.com/u/zfellers)\
**Post date:** [October 18, 2016, 5:47pm UTC](https://forum.inductiveautomation.com/t/referencing-data-type-param-in-alarm-custom-subj-expression/12254/1 "2016-10-18T17:47:00Z")

</div>

Windows 7 64bit  
Ignition 7.8.2

I’m unable to bind parameters to the “Custom Subject” field of the alarm configuration within a UDT.

I have two defined string parameters I’m attempting to bind to an expression in Custom Subject:

{line} + “CCL” + {position} + " ONLINE"

The alarm icon displayed next to the tag within the data structure is immediately “flagged” whenever I attempt to reference a parameter in this field, i.e., simply binding {line} will flag the tag and the console displays the following:

[attachment=0]Capture.JPG[/attachment]