Remember chaps, that the deal is NOT between BAE and the Saudi government, but between the UK and Saudi governments. As such, BAE is a subcontractor and HMG is using them to supply the aeroplanes and services that HMG has sold to the Saudis.
So, if HMG (via the MoD) paid the Typhoon development costs and wishes to flog the beast to the Saudis then it is their perogative.
If these aircraft come out of the original 232 then surely they are the governments to do with as they wish?