I'm looking for a solution to hide, or disable the editing of a list item based on another item within the same list.
A list with the following:
SP1 - Project title
SP1.1 - Task 1
SP1.2 - Task 2
SP1.3 - Task 3.
SP1.2 and 1.3 should be disabled or grayed out until Task 1 is completed with 100%.
When 1.1 is completed, 1.2 can be edited, and 1.3 diabled or grayed out.
I'm thinking of workflows or some sourt of C# solution.
Any suggestion will be greatly appreciated.