Timing requirements to a part of a circuit

set_max_delay -from [get_pins inst21[*]|q] -to [get_pins inst24[*]|d] 2.000

inst21 and inst 24 are registers. If this command is correct? If so, in which cases it works (both regs are clocked by the same clock and enable or clocks and enables could be different)?

I tried it with different enables and common clk, and I got no error or warnings from TA, but from TA reports it's clear that requirement isn't met. At the same time TA doesn't indicate that requirement isn't met.

If anybody is interested in such issue, my simple project is applied.