revert doesn't work via IWP

[winklestork]

A button triggered script changes a status field in every row of a portal.

The user then hits a 'submit' or 'cancel' button to commit or revert this change.

Submit button works as expected.

In FMP client, every update is reverted when 'cancel' is hit.

In IWP, every update is commited when 'cancel' is hit. The only way to revert is to keep track of previous values and reset the fields.

Is this a bug or am I doing something incorrectly?