The GPF A/c has two parts,viz. - "Series" and Number.
Series normally denotes the Department of the Employee, but it always need not be the Department.
Eg. EDN for Education, POL for Police, MEDL For Medical, AIS for All India Service, MISC for Miscellaneous, etc.

The Number is the serial number under each 'series' and is hence unique only in that series. The Series along with the Number forms the GPF Account Number of an employee.
Eg. A/c.No.MEDL/4323 can be the GPF Account No. of Shri XYZ and A/c No.POL/4323 can the GPF Account No. of Shri ABC.

When an employee is transfered from one department to another, he has to apply to this office to change his account number. A new account will be opened under the series of his new department and the balance from his previous account will be transfered to this new account. His previous account will then be closed.

Under no circumstances a series of an account should be changed unilateraly (ie. without the knowledge and concurrance of this office) by any department, on transfer of an employee or otherwise. This will result in duplication of GFP Accounts and the monthly subscriptions of both or either employees will be rejected by the computer system leading to missing credits at the end of the year.