UWL custom attributes absence start and absence end date

Hi All,

I have a requirement to Display two additional columns Absence start and Absence end date fields in UWL. The workflow task number which i am using is TS12300097 . This task is of Object category = 'ABAP CLASS' Object Type = 'CL_PT_REQ_WF_ATTRIBS'. By using XML customization i was able to display two additional columns. But the data rows are displaying banks. I am not sure how the data is being fetched and displayed in UWL. Which attribute should i use to display absence start and absence end dates ?
Kindly help me to resolve this issue.

Thanks,

Vengadesh Rajendran