Suppose your data has a series of attributes that correspond to - say - lines on an order, or lines on a call log, or maybe lines on a time sheet. You want to display the line number beside the other data.
"LINE" will do the trick assuming that attribute 1 is part of that data.
If you just need a count of the "lines" referenced by the multi-value data in attribute 1, then "CTR" will do that for you. The assumption is that there are no null elements in attribute 1.CTR
This Tips was derived from Tom Phillips. He has lost of more samples like this at http://www.tom-phillips.info