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The tutorial RAMP-WIN007: Snapping in a Data Entry Function covers this topic in detail.

A filter manages its associated instance list. When a RAMP screen deletes, adds or changes business object instances, it needs to notify the filter that a change has occurred.

Create the Filter with Program Coding Assistant

To create a filter that listens for changes from RAMP screens use the Program Coding Assistant and select the option Routine to listen for changes and update the instance list:

Image Modified

This option creates Filter Code which Automatically Handles Changes to Instance List.

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