Enum's are not standard odata types. we in webapi odata map enums as strings in the edm model. So, the json that you are sending is incorrect. you should be sending
{ 'Mode' : 'Running' }
Enum's are not standard odata types. we in webapi odata map enums as strings in the edm model. So, the json that you are sending is incorrect. you should be sending
{ 'Mode' : 'Running' }