D.C. Mun. Regs. tit. 6, r. 6-C231
A transfer occurs when an employee moves from a position under one personnel authority to another position under a different personnel authority. Transfers shall be coordinated between the respective personnel authorities.
An employee may be transferred noncompetitively from his or her current position to a new position under a different personnel authority when the new position is of the same or equivalent grade and has no additional promotional potential.
Whenever a transfer alters the substantive rights or benefits of an employee, the employee must agree to the transfer in writing. Substantive rights and benefits include, but are not limited to, employee movements from a unionized position to a non-unionized position and a change in the employee's enhanced suitability requirements.
D.C. Mun. Regs. tit. 6, r. 6-C231