verification for sub con process

hi all

please let me know where i am wrong :

as u know in ps we link material with wbs:

for sub con process we r doing following process pls let me know is it correct or not :

when we run mrp we find sub con PR with account assignment Q and item catagory L, we create PO wrt PR.

we transfer the rm stock to another location (sub con location) through MB1B with 311 mvt type w r t wbs element and vendor.

then migo is done.

is this process is ok or might somthing is wrong ?

please verfy the process and reply ASAP