I have Created the Custome Contact Api to Get And Post Data using the Postmen in Business Central, and It's Working Fine. But Whenever I want to modify the particular Contact it's show error "Error 409 Conflict Another user has already changed the record" see the Screenshot.

{
"error": {
"code": "Request_EntityChanged",
"message": "Another user has already changed the record. CorrelationId: 8ab5f361-7e1d-44d1-9c90-5356da432462."
}
}
In Authentication, I have passed Basic Auth with Web Service Key.
So is there any another way to update the Record?