Release 10.1A: OpenEdge Development:
ADM Reference

canNavigate

Returns TRUE if the object can allow a navigation.

Location: datavis.p

Parameters: None

Returns: LOGICAL

Notes:

An object cannot navigate if there are uncommitted or unsaved changes in the updateTarget or unsaved changes in any of the Datatargets of the updatetarget. - The check is used as rule for enabling of toolbar actions. This includes delete and add / copy as navigation is an implicit result of these actions on the client.
See details in the data.p canNavigate.