BEX Transport request not avaiable nor suitable error

HI,

I am making changes to old report in BW quality. It is showing the errorBEX Transport request not available nor suitable error. I created new request and then i am able to edit the query in BEX designer like that i edited 6 reports . For the 7th report i did the same but it is not allowing me to edit in Coloumn area to edit the query but it is allowing in row and free characteristic area. kindlt guide for this issue

Thanks