The embodiments herein relate to a method in a target RAN node for enabling source based selection of a serving operator which should serve a wireless device in a target shared network. During handover, the target RAN node receives the serving operator that should serve the wireless device in the target shared network. After the handover, the target RAN node transmits a request for the IMSI and receives a response with the IMSI. The target RAN node obtains information about the serving operator stored during the handover. The target RAN node determines a target CN node served by the serving operator if the target shared network is a MOCN network. The target RAN node transmits information indicating the serving operator to the target CN node if the target shared network is a GWCN network.