The "insider-outsider ratio" (ratio of officers who are posted in their home states) is maintained as 1:2. as 'insiders'. The rest are posted outsiders according to the 'roster' in states other than their home states. Till 2008 there was no choice for any state cadre and the candidates, if not placed in the insider vacancy of their home states, were allotted to different states in alphabetic order of the roster, beginning with the letters A,H,M,T for that particular year.
This highly intricate system has on one hand ensured that officers from different states are placed all over India, it has also resulted in wide disparities in the kind of professional exposure for officers, when we compare officers in small and big and also developed and backward state, since the system ensures that the officers are permanently placed to one state cadre. The only way the allotted state cadre can be changed is by marriage to an officer of another state cadre of IAS/IPS/IFS. One can even go to his home state cadre on deputation for a limited period, after which one has to invariably return to the cadre allotted to him or her.
I have extracted this para from wiki and it clearly states that a IAS may be posted in their home state, which shivraj already is, it can not be posted in its home town...and why had they shown last posting of Shivraj in Rajasthan (Chitaurgard) which is also not possible...a IAS can be posted in his home state only once.
Shiv can also be posted outside Rajasthan.