How to decrement a custom field

I would like to decrement the value in a custom field via post function.  I have found the ability to increment by 1 unit (by addon I believe), but not decrement.  

I have tried this using a groovy script post function but believe this is not correct:

 

issue.get(“customField_10426”) = issue.get(“customField_10426”) - 1

4 answers

this is using jira misc workflow utils?

it's helpful to use that tag, otherwise you will get answers for groovy... JMWU tacks on some extra methods that aren't in the API.

Converting Jamie's comment to an answer:

it's helpful to use that tag, otherwise you will get answers for groovy... JMWU tacks on some extra methods that aren't in the API.

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