000787 : esriReplicaSynchronizeBoth is an invalid synchronize direction for checkouts.

Description

Checkout replication allows you to synchronize edits from the checkout replica to the parent replica only. Edits cannot be synchronized from the parent to the checkout replica.

Solution

To resolve this, specify the synchronization direction to be from the checkout geodatabase to the parent replica geodatabase. See Replication types and About synchronization for more information.