Grid Not Available When Setting Up Data Entry Profile

I am trying to set up a Data Entry Profile for truck-mounted DCP tests, and I am running in to a bit of a problem. When setting up the "Data Input" step for the profile I want to use a "DCP Testing" grid that I created which uses a "DCP Tests Data" core entity that I also created. However this "DCP Testing" grid does not appear under the list of available grids when I go to edit the step. I originally tried using an existing grid that is used in a separate configuration pack, but this was also not appearing. I have gone through and checked to make sure every part of the grid is listed as "Active," but it still does not show up. If anyone has any pointers or further aspects I should check it would be greatly appreciated. Thanks.