You can modify unsupported code by following the instructions in Workarounds for Unsupported Features in Workarounds & APIs Guide. The Guide provides examples of some common unsupported features and ways to work around them.
The following modification method is included in Workarounds & APIs Guide, and worth highlighted here because of its importance:
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(Windows only) Using the Appeon workaround for distributed DataWindows.
Appeon Workaround PBL provides two objects appeondatawindow and appeondatastore, and four functions GetFullState, SetFullState, GetChanges and SetChanges, for supporting distributed DataWindows.