No TR/TO created for Return PO

Hi experts,

Now we use 161 movement for return Po reciept type. When we do this receipt, It doens't create the TR and TO.

I checked the document informaiton. in WM information, it use 601 movement an 916 stock type. but bin is 00000000. I am not sure if this is the problem to create TR.

For return Po configuration, Anything need be done for WM area?

Hope to get your advice.

Thanks

Alice