This is a problem of , required data being changed during the current APB session.

Example.

You load APB with work center A

Then you remove few persons from the labor class. 

Then you reschedule operations within APB For removed labor persons ( by drag and drop  lets say).

Then you try to save back the schedule. 

At this point APB can not find the person to assign the operation in the database. Those sort of data inconsistencies may lead to these sort of problems. Try reloading.  It should work. Ideally this should no happen. So please contact RND if problem persists. 

Hi,

Example;

I load APB with  Work center BW-01. Then I did not remove anyone from the labor class.

I'm trying to schedule a newly opened scheduled shoporder for the first time.

I get the same error in other work centers too other than BW-01 work center. There seems to be a different error.

Does the problem appear even if you load full site. Rather than use work center BW-01 filter?