If you remove all the line items from a contract pricing entry, the entry is effectively deleted, both from the user's perspective and from the back-end perspective.
You can see this from the front end by deleting all grid rows for a contract. and then reloading the contract for the same warehouse/customer/address. Note that the inidcator in the status bar then shows as plus sign indicating a new record, instead of the pencil, which would indicate an existing record. For this to be true, you will have needed to delete all grid rows for both tabs (PPG and Item).
The lack of a delete function in the toolbar does make the deletion process harder and less intuitive, but the removal of all grid rows does accomplish the same thing,
