Which attributes of LTI 1.1 AGS can be independently updated?

[AvishkaSandaruw]

Hello,

I was trying to find out Which attributes of LTI 1.1 AGS can be independently updated? so try to update attributes according to canvas lms REST api documentation. but same error occurred every time when I try to update a assignment. can anyone guide me to find out how to solve this & mention resources also. 

error: 

Thank you