How to avoid budget overruns in Projects

Hi All,

As per the user guides, discussionforum, I read that the Budgetary Control funds check will only happen for Expense Purchases. I have following questions -

1. To identify if a PO or PR is expense, the Destination Type will be Expense, correct?

2. Is there a way to perform funds check for PO or PR with destination type as Inventory.

3. If I create my PO and PR for Inventory Items with Destination Type as Expense, i would not be able to use this item in Inventory WIP.

4. Is there a way to control my expenses against the budget online. Do not allow me to proceed if budget is overrun. For Inventory Purchases, Time, Expense Reports