Sending application for new post

Subject : Forwarding of Job Application for outside employment Message : Sir/Madam, I am in a Central Government Service, recently submitted an application for a higher post through proper channel, which has to be in turn forwarded by the Ministry concerned (I came to know that for all Group A Gazetted, applications are to be forwarded by the concerned Ministry). In this case, my application was forwarded from my parental department and has been notified to me with the copy of the same. In that forwarded letter, I could notice a statement that so and so if selected for the post applied for will be relieved by this department after suitable substitute is appointed in his place. At this juncture, I need clarification, in case, if my parental department could not find any suitable substitute, do they have right to withhold me by not relieving from this present post to join the new post? If so, what are all the possibility from my side to legally approach this issue? Kindly note that in a similar situation last year, my application was not forwarded and not notified to me in time. I came to know about this, when I approached the parental department for no objection certificate to attend the interview for the post applied. However, at that point of time, I was told that my application was not forwarded by the then director, on public interest. In view of this, I felt highly distressed and don't know how to get out of this type of hurdles. Kindly clarify and give me suggestions.