Hi Friends

I applied for permanent residency under provincial nomination category. I received the immigration file number from Buffalo office have "PN" at the end of the number. My file was transfered to New York from Buffalo office. Now I have received a letter from New york office requesting some more documents. on the letter the file number is same, however, the alphabet at the end have been changed from PN to ADT.

Does anybody knows what is the meaning of ADT.

Thanks