As such, I do still sometimes get work with Modifier and VBA. I recently did a change to a client where I added several fields to VBA on the Sales Transaction Entry window.
A little later I needed to add a new checkbox and add it to VBA. I customised the window in Modifier to add the field, but when I tried adding it to VBA I received an error I had not seen before:
Microsoft Dynamics GP
You are manipulating a modified window whose EventMode is set to EmOriginalOnly. You must change this window's EventMode to emModifiedOnly before you can add this field.