Issue with Office 365 REST behavior

Hi,

I am facing one issue with SharePoint Online REST API. I have several site columns in list and all columns have different-different internal/display name. but when I try to access any column value using REST it behaves differently.

Ex. I have one column with “Date_Service” as internal name and “Date of Service” as display name. using http://serverurl/_vti_bin/listdata.svc/listname, sometime it displays “Date_Service” and some time it displays as “DATEOFSERVICE”.

Am I doing anything wrong?

Satyam MCITP, MCPD