Sayyiduna Sahl bin Sa'd al-Sa'idi (may Allah be pleased with him) said to Sa'id: Part of the Sunnah method of the funeral prayer is that one says the takbir, sends blessings upon the Prophet (peace and blessings be upon him), then makes earnest supplication for the deceased, then gives the salam inwardly.
Likewise it was narrated from Abd al-Wahid bin Ziyad from Ma'mar, and in my view it is an error; the correct version is the narration of those who narrated it from al-Zuhri from Abu Umamah bin Sahl bin Hunayf.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6991