One possible reason for the error message "Business transaction cannot be carried out" when releasing a network is missing authorizations to release material components. Material components are materials that are required for executing a network activity. To release material components, you need to have the authorization object C_AFKO_ATY with the activity 02 (change) for the order type of the network. Reference: https://answers.sap.com/questions/7530952/the-business-transaction-cannot-be-carried-out-mes.html