No accounting entry - for non-valuated material with account assignement STO

Hi All,

   We have STO for non valuated material with account assignment category.  Only freights cost should be posted as expense at receiving plant caz of which we have created non valuated material and have added freight condition in PO but no accounting document is generated during Post Goods Issue. On contrary, an accounting document is posted for the same material STO without account assignment category. 

   Can you kindly help us with below

1. What would be the influence of account assignment for non valuated material STO

2. Business whats to book freight as expense at receiving plant and consume the material as soon as GR is posted - what would be the possible way out

  Thanks in advance

Regards

Ranjjini