Is't on record that the principal employer would absorb the candidate after 6 months ? And in which case are you willing to give,in turn, the same assurance to the candidate while appointing him take take him on your roll? This particular clause w.r.t. the absorption after 6 months, subject to the candidate being found to be 'satisfactorily completing 'the initial 6 months', likely to be on probation, should be worded appropriately depending on what assurance the principal employer would pass on to you. On the contrary what if the principal employer doesn't honour this commitment after this period ? It is advisable to issue the appointment order as...Temporarily, initially for 6 months and to say...likely can be continued/extended or appointed thereafter depending on the performance of the candidate for 6 months which will be considered as the probation period. This type of appointments are common where candidates are considered for apptt. for a specific project mentioning the tenure. In which case there is an option on either side either to retain or close the contract with some compensation at the discretion of the employer.