Account acc = new Account(
        Name = 'Test Name'
);

insert acc;

SF_Customer_Ownership__c co = new SF_Customer_Ownership__c(
        SF_Account__c = acc.Id
);

insert co;

SF_Customer_Product__c cp = new SF_Customer_Product__c(
        SF_Retailer__c = acc.Id,
        SF_Customer_Ownership__c = co.Id,
        SF_Sales_Position_No__c = 10,
        SF_Status__c = 'Fulfilment Process',
        SF_Suspend_Reason__c = null,
        SF_Terminal_Identifier__c = 'TItest',
        SF_TerminalType__c = 'ATM',
        SF_Com_Type__c = 'PSTN',
        SF_IPAddress__c = 'TestAddress',
        SF_Manufacturer__c = 'NCR',
        SF_Model__c = 'TestModel',
        SF_SerialNumber__c = 'TestSNumber',
        SF_SupportHour__c = 'TestSupportHour',
        SF_Support_Team__c = 'North',
        SF_PollLineNo__c = 'TestPollLine',
        RecordTypeId = SF_DAO.getRecordTypeId('SF_Device_ATM', 'SF_Customer_Product__c')
);

insert cp;

System.debug(cp.Id);