Indeed it is true that compulsory MBA has been discontinued. However FBR has made a new policy according to which officers who want to enhance their skills and capabilities are allowed to pursue MBA either at IBA Karachi or LUMS Lahore.
A candidate who wants to avail the opportunity shall

1- get admission into these institutions on his/her own.
2- will have to satisfy the criteria set by the management.
3- after getting admission he/she will write to the FBR and then FBR will make provisions as to the payment of fees by the government.

I hope it was helpful.

Regards

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M-M-M