Take any browse procedure with an EIP field in it as well as a standard Insert button (ie, the Insert button ticked off on the Form tab so that it appears below the browse as normal): if you make a change to the EIP field value, the Insert button disappears.
It is easy to reproduce. I just compiled the Accounts example app, went to the Invoice screen, and edited either the EIP product quantity or EIP amount in the upper right hand child browse. Both the Insert and Change button below the child browse disappear.
Regards,
Mark