It’s time for that special Friday Minchah again:
If one forgets to say ya’aleh v’yavo at Minchah Friday Rosh Chodesh, and doesn’t remember to daven over before it is already too late, and Shabbos is NOT Rosh Chodesh, it is a major shayloh if one can daven ma’ariv twice. Such a case (where you will not be saying yaaleh veyavo at the make-up tefillah) is a general shayloh even if it occurs during weekdays, and the aytzah given is to daven the “repeat” Tefilla as a nedava – but this cannot be done on Shabbos!
Mishneh Berurah says: Only one shemoneh essrei by Ma’ariv. No aytzah, sorry.
Aruch HaShulchan is noteh: Two. The final Halacha is probably to treat it simply as a missed Tefillah, and “so what” if you will not be saying ya’aleh v’yavo at the makeup Tefillah.
Rav Malinowitz says: DON’T FORGET YA’ALEH V’YAVO AT MINCHA!!