Middleware debug problem for BP's from CRM to ECC

I tried few steps to debug BP changes from CRM to ECC but nothing is working ...

I deregistered the Queue thru SMQS, made changes to BP.. went SMQ1 select the Queue name Double Click 2 times.. then select the Tool bar (Debug LUW).. I'm getting "Nothing was selected"

When is see SMW01, BDOC is processed green and data is transferred to ECC.

I want to do debug the BP queue and go to ECC system as some of my custom EEWB fields are not passing to ECC correctly.

Any help is highly appreciated.

Thank you.