Cash Discount Accounting

Dear All,

In my case vendor has send invoice for a material (x) ,the price is 100/unit

a payment terms negotiate ,that if i paid it within 10 days then i can get 10% discount. in the time of invoice posting this 10% discount amount going to the discount Allowed (Expenses) a/c and this amount adjusting with the material as below

Vendor a/c------ 100 -

Gr/IR a/c -

100 +

material a/c -

10-

discount allowed a/c -

10 +

but i want as

Vendor a/c------ 90 -

Gr/IR a/c -

100 +

Discount Received a/c -

10-