Cannot activate Datasource

Hello,

I have modified a datasource and replicated due to which my datasource is inactive state (in the datasource maintainence i could see its version :modified and active version : does not exist,and as u know i cant change an emulated datasource ,but iam sure i could activate this modified datasource but strangely the activate option is greyed out ......,

P.s : I have already loaded some data intothe master datainfoobject ,so is that caused any problem ???

Pls let me know ur suggestions .....