Before transacting with Murphy, you may have to accept the Trading Relationship Request in Ariba. See below instructions on how to do so.
NOTE: Only the account administrator can preform this action
1) CLICK Account Settings > Settings > Customer Relationships
2) Review the Trading Relationships here. The request may be in the Pending tab. On this screen, you may also change to Automatically accept all relationship request if you do not want to review every one.