You find the field name and data element for the screen fields by right clicking in the field itself, and then select HELP.Once there, click on the Technical Information button. In the field data section you will then see the field name and the associated data element. Then you can execute transaction SU20. Do a search for the field name. Sometimes you'll find an exact match, and sometimes it will only be similar. For example, for movement type you might see BWARTWA as the field name but you will only find BWART in SU20. Once you find the field name or data element in SU20, you can do a line select, and click on the Display button. At the bottom of the resulting screen, you will find all the authorization objects that use that field. You can then look in SU24 for the transactions that use that object. I hope this helps. Keep in mind though that not all screen fields are going to be checked via authorization objects. They have to be designated as key fields.
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