Regardless of the context, one may refer to following decision of Hon'ble Supreme Court:
in 1966 (1) TMI 79 - SUPREME COURT wherein it was held:
11. The first question which has been raised before us by Mr. Bishan Narain is that though the respondent came to know about the order of his dismissal for the first time on the 28th May 1951, the said order must be deemed to have taken effect as from the 3rd June 1949 when it was actually passed. The High Court has rejected this contention; but Mr. Bishan Narain contends that the view taken by the High Court is erroneous in law. We are not impressed by Mr. Bishan Narain's argument. It is plain that the mere passing of an order of dismissal would not be effective unless it is published and communicated to the officer concerned. If the appointing authority passed an order of dismissal, but does not communicate it to the officer concerned, theoretically it is possible that unlike in the case of a judicial order pronounced in Court, the authority may change its mind and decide to modify its order. It may be that in some cases, the authority may fell that the ends of justice would be met by demoting the officer concerned rather than dismissing him. An order of dismissal passed by the appropriate authority and kept with itself, cannot be said to take effect unless the officer concerned knows about the said order and it is otherwise communicated to all the parties concerned. If it is held that the mere passing of the order of dismissal has the effect of terminating the services of the officer concerned, various complications may arise.
Similarly in 2012 (7) TMI 383 - SUPREME COURT, it was held that:
"33. The aforesaid observations make it clear that an order passed by an authority cannot be said to take effect unless the same is communicated to the party affected. The order passed by a competent authority or by an appropriate authority and kept with itself, could be changed, modified, cancelled and thus denuding such an order of the characteristics of a final order. Such an uncommunicated order can neither create any rights in favour of a party, nor take away the rights of any affected party, till it is communicated."
In 2010 (8) TMI 932 - SUPREME COURT:
24. Thus, in view of the above, it can be held that if an order is passed but not communicated to the party concerned, it does not create any legal right which can be enforced through the court of law, as it does not become effective till it is communicated.
In context of Income Tax, "Issuance of order" has been interpreted by Kerala High Court in 1997 (2) TMI 76 - KERALA HIGH COURT:
It is not enough if the order is made, signed, and kept in the file, because such order may be liable to change at the hands of the authority who may modify it, or even destroy it, before it is made known, based on subsequent information, thinking or change of opinion. To make the order complete and effective, it should be issued, so as to be beyond the control of the authority concerned, for any possible change or modification therein. By applying the above principle it has to be taken that before the assessment order has become effective by issuing the same by the office of the assessing authority, the assessee has filed its returns.