1 Pa. Code § 35.50
The agency head may at any time, or during a hearing the presiding officer may on his own motion or the motion of a participant, direct a party to state his case by way of amendment more fully or in more detail. The amendment shall be reduced to writing and filed within the time as may be fixed therefor.
1 Pa. Code § 35.50
This section cited in 34 Pa. Code §111.15 (relating to no other pleadings allowed); 34 Pa. Code §131.35 (relating to amendments to pleadings); 34 Pa. Code §131.36 (relating to joinder); 34 Pa. Code §131.57 (relating to compromise and release agreements); 34 Pa. Code §131.60 (relating to resolution hearings); 52 Pa. Code §5.93 (relating to directed amendments); 52 Pa. Code §1005.63 (relating to directed amendments); 55 Pa. Code §41.82 (relating to amendments of requests for hearing); 58 Pa. Code §493a.7 (relating to amendments and withdrawal of pleadings); and 61 Pa. Code §703.2 (relating to petition content).