Data From Secondary Source Not Populating

Hello,

I have two data sources (one of which is a live Teradata connection) and the other is just from a flat file.

Essentially, I have a common column in both of the tables (which is my join key), which is Days since an event. In the Teradata connection, I have values that look like 0-26. In the flat file source, I have data ranging from 0-48. The flat file data source has only two data points, at 18 and 48.

When I plot these (using the flat file day value on the X axis) I can see the value for day 18, but not from day 48.

Any idea how to resolve this error?

Or perhaps to put it another way, is it possible for me to simply create a dummy set of coordinates to plot a line on the graph?

Thanks,

Andrew