Ask Rav LJ: The One who makes THE peace

This has bothered me for years: During the Ten Days of Repentance, we change the wording "Oseh shalom bimromav" (The One who creates peace on high) to "Oseh HA-shalom bimromav" (The One who creates THE peace on high) in two places -- at the end of Amidah and at the end of Kaddish. But apparently we don't do it in the third place where this sentence appears in our liturgy, towards the end of Birkat ha-Mazon. I wonder: why not?

I think that the earliest source for the first two cases is מטה אפרים סי' תקפ"ב סעי' כ"ב but I'm not 100% sure, and I don't have a copy of that source. Anyone out there have access to it and/or additional information?

( Additional information )

Ask Rav LJ: The One who makes THE peace

This has bothered me for years: During the Ten Days of Repentance, we change the wording "Oseh shalom bimromav" (The One who creates peace on high) to "Oseh HA-shalom bimromav" (The One who creates THE peace on high) in two places -- at the end of Amidah and at the end of Kaddish. But apparently we don't do it in the third place where this sentence appears in our liturgy, towards the end of Birkat ha-Mazon. I wonder: why not?

I think that the earliest source for the first two cases is מטה אפרים סי' תקפ"ב סעי' כ"ב but I'm not 100% sure, and I don't have a copy of that source. Anyone out there have access to it and/or additional information?

( Additional information )