Ethics - trade adjustment policy allocation, something, accounts, interest, problem

fishmarket

The problem on page 261 of the Ethics book talks about interest adjustments for erronous trades made to a client’s account.  Look at questions 3 and 4.
What section talks about crediting client accounts in case of trade allocation errors?  The answers make it sound like it was covered in the text, but I cannot find it.  Is this something that we are supposed to conclude on by ourselves?