Dennis @ PerfectForms
You could create a behavior on submit that loops through the table and at each row uses a simple branch (is *field* – current row empty?). If true, use a Show Message behavior object. The empty field in the table will remain highlighted.
Build the behavior like this:
Set Table Rows – move to first row.
Simple Branch – Is field empty?
If true, show message. if false move on to
Set Table Rows – Move to next row.
Simple Branch – Last Behavior was successful?
If true loop back to first Simple Branch
If false go to Exit behavior object.