does it have to be a data line or can you use a header or footer line for this request? A header or footer line will be printed only once per page, hence my question.
If it has to be a data line, could you describe a little bit more detailed, why this line only needs to be printed once? Are there other objects after this data line, that are supposed to be printed on the same page? Also is the value supposed to change per page, for example with your data line → page 1 = value 1, page 2 = value 2?
You could use the condition LL.FCountPrintedDataThisPage=1. It might be necessary to use 0 instead, though; unfortunately, I can’t verify it at the moment since I’m using my mobile.