Up until recently, custom field data was sent one-way Aha to Jira.
For certain fields, we prefer the data sent one-way. We want to be able to send information such as business goals so that people using Jira can understand more about what's trying to be accomplished, without having to worry that this info will get edited.
We have launched an enhanced Jira integration. This integration gives you the ability to define mappings and sync directions field by field, along with several other new capabilities including the ability to: