In documentation (RM0503), I2C CR1 register contains SBC bit field (Slave Byte Control), at position 16. Unfortunatelly, LL driver files (actually stm32u073xx.h, which is referred by driver files) have no corresponding defines.
Thank you so much for reporting this issue. I Confirm this issue and I've report it to the concerned team for correction on the next release (under internal ticket number 181039).
Best Regards.
STTwo-32
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