Hadith.993 - The meaning of the narration that was reported:
"The jurist (faqih) does not repeat the prayer,"
This applies to the third and fourth units of prayer, not the first two.
And the prostrations of forgetfulness (Sajdah al-Sahw) are obligatory only for those who sat while they should have been standing, or stood when they should have been sitting, or omitted the Tashahhud, or were uncertain whether they had added or omitted something. The prostrations are done after the Tasleem (salutation) in cases of addition or omission.