I have a parametrized dataset, that I used for a copy data activty and it worked fine. I am trying to replicate that using a mapping dataflow but I cant find where to input the value for the dataset parameter...
3 Answers
I landed here as I was having the same issue. I managed to work out the following.
At the top of the design panel you have an option for "Data Flow Debug". Turn that on. And having done so, you'll then be prompted for "Debug Settings" (which you can edit as required using the option that appears next to the "Data Flow Debug"). Here's a little screen-snip of the relevant stuff:

