ID:13102 Not allowed to move at least <number> registers due to timing assignments

CAUSE: You attempted to optimize netlists by directing the Quartus Prime software to perform gate-level register retiming. However, the Quartus Prime software cannot move the specified number of registers because they are involved in timing assignments. The number of registers reported in this message may be lower than the actual number of registers with timing assignments, because some registers may not be allowed to be moved for other reasons.

ACTION: If you want to allow the Quartus Prime software to move these registers, set the Netlist Optimizations logic option to Always Allow. The retiming algorithm will not change the timing assignments due to the movement of these registers and it may merge registers that have incompatible timing assignments. Otherwise, no action is required.