Issue: system not allowing to change key figure data type.

hi,

I want to change my key figure DATE data type to DATS (now it is DEC), system is not allowing to edit .

so we deleted the data in info-cube but can't delete data(request) in my wright optimized DSO , when tried to change the status to red, it showing request status can not be set to 'RED' in its current state.

just got information from forum https://scn.sap.com/thread/1416935.

(If no change log exists for the concerning request, you cannot delete it.Only a full deletion of all data or a selective deletion will work.)..... but problem is i am not understanding what is this change log.

can anyone suggest me how can i delete request in dso or how can we change key figure data type.

Thank you