4.105—Dismissal for lack of jurisdiction.
Any motion challenging the jurisdiction of the Board shall be filed promptly. Hearing on the motion shall be afforded on application of either party, unless the Board determines that its decision on the motion will be deferred pending hearing on both the merits and the motion. The Board has authority to raise at any time and on its own motion the issue of its jurisdiction to conduct a proceeding and may afford the parties an opportunity to be heard thereon.