Is there any easy way to find from technical information by structure name what
table data was used to fill the particular screen field or table control?
This can be a tricky task. However, i'll post the actions I usually do if it's a sctucture field:
1 - in techical info pop-up, double-click data element. This will navigate to SE11, data element. There, click where-used-list button in the top, marking options tables and views
2 - if this doesn't work, check the program of the tcode. See TABLE declarations, SELECT statements and "suspicious" FM's or methods.
3 - if this doesn't work, start thinking that probably is a calculated field, which means that probably isn't stored anywhere!