When an appeal is taken from a decision of the Department, the Department shall be deemed to have ruled upon all matters and questions pertaining to the claim. In hearing the appeal the tribunal shall consider the issues expressly ruled upon in the decision from which the appeal was filed. However, any issue in the case may, with the approval of the parties, be heard, if the speedy administration of justice, without prejudice to any party, will be substantially served thereby.
34 Pa. Code § 101.87