Imaam reciting "Rabbanaa lakal hamd"
Q: In Kitaab al-Asl of Imaam Muhammad it states that according to Abu Hanifa the imaam should not say "Rabbanaa lakal hamd". But in the same book Imaam Muhammad ask Abu Hanifa whether the Imaam should recite basmalah, amin and Allaahumma rabbanaa lakal hamd silenty and Abu Hanifa says yes. Why this contradiction?