Nintex Delegate Error - This task is currently locked by another user

[#1]

Hello again,

Finally i found how to change 'Assigned To' column in Workflow Tasks, that is by using Delegate API

Yes when I tried the API, the 'Assigned To' column changed to new user let's say from 'User 1' to 'User 2'

but in 'User 2'  MyTask Webpart , there are no any task assigned to 'User 2' and when I tried to force approval by accesing link to approve while signing in as 'User 2', i get the following error "This Task is currently locked by another user. Please try again"

Thanks

[#2]

Found the solution by using Nintex WebService Delegate