Problem:
When I go to order, the online form auto-fills everything but the Part Revision section. When I try to press the ‘Check Out’ button, I receive an error telling me that I must enter a revision number. However, the Part Revision section is grayed out and will not allow input.
Solution:
On your layout view, scroll over to the title block.
Set your select filter to text only.
In the title block, find the revision box, in that box, wiggle your cursor around until you find the revision property, it will be blank, but still there.
right mouse, properties, enter a revision level, it can be anything, but it sounds like it's just an empty placeholder right now.
Once it has something showing, you should be able to order.