Portfolio for JIRA and JIRA Server: target start / end dates

[Tomas Kupčinskas]

We have JIRA Server and I am testing Porfolio for JIRA plug-in. But I cannot find Target Start or End dates fields. 

I have tried to find them in the Custom Fields or create and add fields "Target Start or End" by myself, I have added all possible date fields what I have found, however synchronization is not  possible. I am getting error messages: "Unable to commit item's baselineSTART" and "Unable to commit item's baselineEnd".

Any ideas? I have read this article, but it is not very helpful: 

https://confluence.atlassian.com/jiraportfolioserver/showing-portfolio-custom-fields-in-jira-857058481.html?_ga=2.5556277.704316374.1561972143-310506224.1559049701