If someone by mistake didn’t say “atah yetzartah” and instead davened a regular musaf on Shabbos Rosh Chdoesh, would they be yotzei bedieved, since they did say “musafim kehilchasam”?

Answer:

No, if “ata yetzarta” is forgotten, and one has already finished the Mussaf davening, one must repeat Mussaf.

The reason for this is that this involves a significant change in the text of the berachah.

Best wishes.

Sources:

Chayei Adam 28:4; Mishnah Berurah 268:16.

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