Abu Isa (al-Tirmidhi) said: I asked Muhammad bin Isma'il al-Bukhari (may Allah have mercy on him) about it, and he said: Nafi' differs from Salim in some hadiths, and this hadith is one of them. It is as if he considered both hadiths sahih, and that both are possible.
Abu Ali said: I asked Abu Abd al-Rahman al-Nasa'i about the hadith of Salim and Nafi' from Ibn Umar regarding the story of the slave and the palm trees, and he said: The correct view is that of Nafi', even though Salim had a stronger memory than him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10763