How do I update a 'test case' attribute in a vPlan using the vManager API (vAPI)

Hi All,

I have a vPlan (in .vplanx format) which contains a hierarchy of sections and at the bottom of the hierarchy, each section contains a test case, checker or coverage item.

Each item has associated vPlan attributes such as 'Implementation Note', 'Details', 'Owner' etc.

In my case, I'd like to change the value of an attribute (actually a user-defined attribute) associated with a test case from 'false' to 'true'. I'd like to do this using the vAPI.

I've previously used the vAPI for basic operations such as getting a list of sessions but it's not clear to me which of the vAPI commands I'd use to change a vPlan attribute value.

Please could someone give me some pointers and if possible some example JSON code.

Thanks.