how can I default the expense account rule on iproc

I have an item X and linked to Org A

The expense  Account is (1.666666.0000.000) assign to item X for the ORG A

the category of item X has an account define in the account expense rule for segment two is 8888888

the employee has an account 1.688877.9999.000

go to iproc and select item X

I need to default the expense account rule from employee and category even the expense account is defined on the item level?

I am able to default the expense account rule from employee and category but I have to remove the expense account at item level