java API to get Version Information value from Delivery Work Item

Hello,
Below is the java API which gives me the delivery work item details but except 'version information' details.
IWorkItem workItem = RTCUtilsUSA.getDeliveryWorkItem(teamRepository, fetchedBaseline, monitor);
Please let me know which is the API to fetch version information in delivery work Item.
Thanks,
Swapnil
One answer

First of all, the API above is not part of the RTC API. I am 99.99999% sure of that. This seems to be some custom API.
Second the work item type Delivery Work Item is most likely a custom type, so no one here can know what 'version information' is.
See https://rsjazz.wordpress.com/2013/01/02/working-with-work-item-attributes/ for a general introduction into work items and their attributes and the related API.