The legal case is in the hands of the Eighth Civil Court of Judge Félix Igarzábal, in Buenos Aires City, where the woman lives. The case will also be assessed in a criminal court in Mar del Plata, where the incidents allegedly took place.
The parliamentarian is prohibited from making contact with the alleged victim.
Mosca is the husband of prominent national Senator Gladys González.
It is the second high-profile case of its type in Buenos Aires province's Congress, amid a wave of allegations late last year about sexual abuse and violence committed against woman by men in positions of power.
Kirchnerite senator Jorge 'Loco' Romero also faces court proceedings for the alleged assault on Stephanie Calo, a fellow member of the La Cámpora youth movement led by national lawmaker Máximo Kirchner.