” compelling source”
how about the Mishna berurah in 108 36 (and wikisource from some crazzy reason thinks that ben ish chai, lvush , kitzur, shulchan aruch harav and aruch hashulchan come before MB so i cannot qoute it for you.)
Mechaber 108, 11 ??? ????? ?? ??? ?????? ????? ???? ??? ????? ?? ??? ????? ?????? ??? ???? ????? ????? ????? ?????? ???? ????? ???? ????? ???? ???? ?? ??? ???? ???? ?? ?? ????? ???? ???? ????? ?? ??? ????:
however the MB 36 says if a one day rC is erev shabos you do not repeat because there is no nedavos on shabbos.
It could be lchumra you should have in mind to be yotzei by mein sheva ( big maharsham about this somewhere)
other eitzos
1.you can be shoel on the kaballas shabbos. ( however it could be a problem of lemafrea making brachos levatala. I once saw such a chasam sofer about being shoel on hafrashas teruma.
Abou vsain tal.
3. REB Chaim Stensils in Brachos 26b says that not mentioning (Yaaleh Vyavo to those that argue on tosfos 26b and) Vsain Tal Umatar has the din of not davening therefore you must redaven maariv of shabbos like the Shulchan aruch in 108-9 However Har tzvi oraach chaim 54 and Steipler brachos 16 and other poskim argue regarding vsain tal umatar and you do not have to repeat it leil shabbos ( i remember seeing in an early chelek of yeshurun a long shtickel on this from dayan fisher zt”l who brough many rayas to the har tzvis opinion.
Now dedicate a troll.
btw.. what does mussaf have to do with anything.