Not needed. When there is a well laid down norm, for your sake the bank can not overlook and violate the rules and regulations.
Now search in DOPT O.M. and find out their circular on such transfers. I remember well that there was never any such stipulation for PSUs under Central Government , as every organisation has to implement DOPT directives.
If you find convenient stipulation helpful to you, immediately go to pgportal on line and file this as grievance in DOPT.pointing out the anomoly.
That is all what can be done ultimately.