If you'll allow me, I suggest you ask this same question on the Log4OM forum. Since it works as desired in ACLOG and not in Log4OM, I imagine it is something on Log4om's part.
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Even though I am a user of log4OM, I cannot answer you. Have you tried the manual?
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I can automatically save (only save) a qso made in FLDigi through the UDP configuration described in the Log4OM manual.