post GR against LPA scheduling agreement?

Hello I have a scheduling agreement of type LPA.

I have released the JITs and FRC.

The delivery dates are in the past

No confirmation control key.

I try to post a GR via MIGO, but I get the message "Document does not contain any selectable items".

Is it possible to post a GR via MIGO for LPA scheduling agreements? OR do I have to use inbound deliveries?

Sofia