Problem in LQ02

Hi

Pls help me figure out what‘s the problem.

  I  go to LQ02  and trying to cancel blocked quants,  there are four bins being blocked， I choose the last one and click post change ，the record become red ，the log shows ’Quant  cannot have a posting change‘，but when I choose  the first one ，the record become green，and then the second and the third  ，it’s also OK，and I keep post the last one ，this time the record become green. I don't understand this ， why can't I post change the last bin first.

  william，

thanks in advance.