18- 389 C.M.R. ch. 9, § 6
An employee who is promoted prior to the completion of his/her probationary period to a higher position in the same occupational field shall complete his/her probationary period in the lower position by service in the higher position and the appointing authority shall certify him/her for permanent status in the lower position at the end of the six months' period following original appointment to that position if the employee is to be continued in the state service.
When a probationary employee is granted a leave of absence to accept a position in the unclassified service, the unfulfilled portion of the probationary period in the classified service may be completed by service in the unclassified service position subject to a positive recommendation of the appointing authority and approval of the Director of Human Resources, provided that the work in the unclassified position is within the same general occupational field and is at least equivalent in difficulty and responsibility to the work of the position in the classified service.
Former employees appointed from eligible lists other than the layoff list shall be subject to the probationary period beginning the date of new appointment.
Former employees laid off during the probationary period shall be credited with time served on probation upon reinstatement from a layoff register.
The probationary period of an employee demoted without prejudice during or at the end of his probationary period shall include the period of probationary service in the higher class.
18- 389 C.M.R. ch. 9, § 6