I have class
def add_graph_to_screen(screen_id, graph_id, x, y)

message = {
'method' => 'screen.update',
'params' => {
'screenid' => screen_id,
'screenitems' => [

{ 'resourcetype' => 'graph', 'resourceid' => graph_id, 'width' => '800', 'height' => '200', 'x' => x, 'y' => y, 'valign' => 'Middle', 'halign' => 'Centre', 'colspan' => '0', 'rowspan' => '0', 'elements' => '0', 'dynamic' => '0', 'url' => '0', 'style' => '0' }

]
}
}

Using
zbx.add_graph_to_screen(screen_id, id, x, y)
y += 1

where id incremental changed for my host i can't update my screen due permission issue.
Message: [Application error.]. Data: [[ CScreen::update ] You do not have permission to perform this operation].

Alsi i can't delete

Actually i need this:

Create screen with hostname of my monitored host, and settled it with my graphs. I delete screen, create screen - it's ok, but when u try to update screen with graphs i get wroted issue. Maybe i'm doing something wrong, but i can't realize to screen.screate with incremental of y value, because after first settle of first graph at second step i get message, screen already created.