specify atleast one quantity

Hi all,

While doing Migo am coming across an error "specify atleast 1 quantity".

I have done GR with respect to PO and i couldn't post it due to the above error. I even have tried creating a different material but yet the same result.

What ever the discussions related to the above issue in scn have not got me the perfect solution.

kindly help me to solve this and to get the GR posted.