@Abdul Rahim Chaudhry

We are not discussing implementation of rules; that is anothe issue.
Not only in Lahore, in every Region/District, some SIs are serving as SHO.
Posting of SP as DPO is not exceptional nor rare. In many Districts, SP is posted as DPO. In Bahawalpur Region, all the three DPOs were SsP. They kept serving as DPO for months, and now they have been promoted as SSP.
You might have read both terms, but usually the people of other departments dont know the difference and read AIG as Addl: IGP, which is incorrect. Compare ASP and Addl: SP, ADIG, etc.

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