if you used LDW as the connection/service name when you setup this connection to CMS DB, then no further changes to BOE configurations will be needed.
If you used the service name PO and now it is changes to NEW_PO - then you'll have to update CMS DB connection info in CCM>SIA>Properties>Connection.
See Admin guide for details.
p.s.
BOE services should be stopped while your changes on Oracle side are done and before you change the TNS file and connection info in CCM.