2488816 - "Object locked in inconsistent task" Error while implementing note using SNOTE

While implementing a note using SNOTE, following message is displayed,

On clicking on the highlighted button, following description is displayed,

or

"Request xxx belongs to a different client"

SNOTE

Message no. TK582, This request does not exist or is assigned to another client. Repeat your function later. If the the error occurs again, notify your system administrator. The inconsistent task has to be corrected by assigning it to an existing request. If the task is assigned to a request in different client, this request must be released first. Request xxx belongs to a different client. , KBA , BC-UPG-NA , SAP Notes Assistant , Problem