Need to Default to Expense account Instead of GR/IR account

Gurus,

We have a scenario where for certain Valuation class for Materials need to Default to an Expense Account instead of GR/IR clearing account.  Below is the scenario.

1) Create a FO for Material with no " GR Required".

2) Do the MIRO against the FO.

3) It should post it to Vendor account against an Expense account.

I am not sure if this is possible. If yes, could you please share some thoughts on this.

Thanks,

Senthil Thiruvarasan