SAP Message BMA_GEN007 - Internal error when changing the navigation display

Diagnosis An internal error occurred while generating or editing the nodeinformation in the navigation tree. The node data is probablyinconsistent or there is an error in the DDIC. Procedure Try to remove the inconsistencies in the data by exiting thetransaction and then calling it again. Procedure for System Administration Check whether the BMA_UNODE structure is actively available.