I am utterly vexed.
I have a lookup field that is showing up in forms without the ability to edit. It's only showing up as a Display field, and I don't have the ability to select "Edit Lookup" in the column drop down.
I have another list where it is working correctly. When I drop in an edit form, it gives me a drop down control connected to the list.
Can someone help me figure out what the difference is and how I can get a drop down control in my form connected to List A?