We are using Sugar Enterprise v25.1.
I am trying to create an Action Button to show on the Contract record. The button is supposed to create a document which will house the fully executed contract file.
When I configure the button and try to find "Document" from the module list, I can find several modules, but not "Document".
I double checked that the "Document" module is available, not hidden.
I double checked that the "Document" module is listed in my "Display Modules" list.
I double checked that I'm using the correct Action type -> "Action Button".
Why am I not able to see the "Document" module listed? 
Thanks for any help.

