Google "iwp field validation"
IWP: validate & edit record securely
In many scenarios using FM / IWP, it's desirable to allow a person to create a new record, have the record validated, and either accept it into the system or show them errors and correct / resubmit, or cancel / delete. Once done, it's also important to block any further access (read or edit) to that record, for security purposes.
Useful overview of IWP limitations.
Thread: IWP Limitations and design workarounds
The Computer Guy, Seattle