Section 123(3)(e) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(e)[ Officers who specialise as Constructors and are unable to obtain their Engine Room Watchkeeping Certificate, owing to the exigencies of the service, may be promoted to the confirmed rank of Lieutenant, when due for such promotion. They shall also be eligible for further promotion (acting or confirmed) notwithstanding their not being in possession of the Engine Room Watchkeeping Certificate. They shall, however, be required to obtain the said Watchkeeping Certificate within one year of becoming available for employment in the General Service.] [ ]