is a seriously defective abbreviation, for among the scholars it is understood that an unqualified citation of al-Ṭabarānī means the report is found in his Muʿjam al-Kabīr; if some other compilation is meant, the citation is restricted accordingly. That is exactly what al-Haythamī did in Majmaʿ, 1/204, where he said:
“Al-Ṭabarānī narrated it in al-Awsat …”
Al-Munadhirī worded it the same way in al-Targhīb.

His statement under no. 10 reads: ʿĀʾishah said, “Whoever tells you that the Messenger of Allah ﷺ urinated standing—do not believe him, for he only urinated sitting.” It was narrated by the Five except Abū Dāwūd, and al-Tirmidhī said, “It is the finest and most authentic report in this chapter.”

I say: Its chain from ʿĀʾishah is weak, for it contains Sharik—namely, Ibn ʿAbd Allah al-Qāḍī—who is weak, and nothing he alone transmits, such as this ḥadīth, can be used as evidence. Al-Ḥāfiẓ says in al-Taqrīb: “Trustworthy but makes many mistakes; his memory deteriorated after he was appointed judge.”

Al-Tirmidhī’s remark that “it is the best …” does not prove the report to be good, much less sound; it only indicates a relative degree of goodness or soundness, as is known to specialists in this noble science.

I later discovered a strong corroboration for Sharik, whereby the ḥadīth becomes authentic, yet it is a negating report, whereas the ḥadīth of Ḥudhayfah that follows in the book is affirmative. As is well known, an affirmative report takes precedence over a negating one because it contains additional knowledge. Therefore, both manners are permissible; what is obligatory is to guard against urine splatter, and whichever posture achieves that suffices. See Irwāʾ, 1/95, and al-Ṣaḥīḥah.

As for the ḥadīth, “It is a mistake for a man to urinate standing,” it is not authentic ascribed to the Prophet; the correct ruling is that it is mawqūf. The explanation is given in Irwāʾ, 59.