(1) An immediate appeal shall be filed in writing with the appellate court within a non-extendable period of two weeks beginning upon service of the decision or, in the case of Section 171(2), upon the expiry of the time period.
(2) Reasons for the immediate appeal shall be given when it is filed. The statement of reasons for the appeal shall contain:
1. a statement as to the extent to which the decision of the public procurement tribunal is challenged and a deviating decision is applied for,
2. details of the facts and evidence on which the appeal is based.
(3) The notice of appeal must be signed by a lawyer admitted to practise before a German court. This shall not apply to appeals lodged by legal persons under public law.
(4) When the appeal is filed, the other parties to the proceedings before the public procurement tribunal shall be informed by the appellant by way of transmission of a copy of the appeal.