What about that traveler who offered full four Rakaats of obligatory prayer?

         What about that traveler who     offered full four Rakaats of                  obligatory prayer?

                                         

Answer:

 If a traveler offers full four Rakaats of obligatory prayer by mistake then he should observe Sajdatus-Sahv سجدۃ السہوّ in the end of the prayer. 

The prayer so offered will be treated as two "Farz" and two "Nafl" and if he offered four Rakaats intentionally with "Qa'adah" after two Rakaats, his obligatory prayer would be deemed to have been observed and later two Rakaats would be treated as Nafl but he is sinner.

 And in case of non-observance of Qa'adah after two Rakaats his "Farz" prayer would be deemed to have not been offered. This prayer will be treated "Nafl". He ought to repeat the prayer to accomplish "Farz".