Hi,
Try this:
Instead of variable name, select "String" for Data Type
and then, for data value type, select "A list of Values"
You should then see (on the left) a "Load Values" button that will let you choose a dataset and choose a variable in the dataset. On the right, you can choose either a single selection or a multiple selection. If I am going to make them pick something from a list, I ALWAYS check/select these choices:
A value is required at runtime
Prompt for value (and your list of variable values will be used)
You can decide about quoting -- I always put my own quotes, unless I'm allowing multiple values separated by a comma (as in a where clause with an IN).
For more help with setting a list of parameter values in EG, for a numeric variable or for a date value, you might consider contacting Tech Support.
cynthia