Add New Lookup Field to Item Card Page

I can't seem to find the exact answer to this, so here goes. I created a new field in the Item table titled "Work Code". I added the field to the Item card. I set the Source Expression to DATABASE::"Work Type" (I didn't know how else to select that table) with the TableRelation/Table to "Work Type". Once I compile and run the Item card, "Work Code" shows as a caption, but in the control, it just shows the table number (200) which is a lookup field, but I unable to select a Work Code from the list and keep it on the Item Card. The "Work Type" table does have a "DropDown" entry.

Thank you for your kindness...