For example, I could define a screen with a field mara-matnr. In the PBO, I could have some code that says "MARA-MATNR...
= 'MY_MATERIAL'". When the screen is displayed, the field will contain the value 'MY_MATERIAL'. At no point has a database read been done.
So, how can you find where the fields are actually populated? The most widely used tools are SQL Trace, Run Time Analysis and of course the debugger. These techniques, and others, are widely available across the Internet.
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