Voucher Match Variance Amount in not Journalized

Hi Gurus

 

Usually Receipts amount equals to the invoice amount. But in some cases invoice amount could me plus or minus. At the time of Match Voucher to Open Receipt we can avoid error message by modifying the receipt amount in detail line according to the invoiced amount. But problem is there it is not journalizing the variance of RNV and invoice. For example item journalized RNV at 100 but vendor invoiced 90 for that item. There is variance of 10. Cost Variance field getting updated but it is not going journalized. Anybody can help me in order to resolve this issue?

I already maintained the AAI 4330. Kindly let me know what I am going to miss in setup/configuration.