cutomer returned broken goods besides giving cusotmer credit note, what else?

Hi Stacey

(Assuming the Items have been setup as Inventory & you have issued a Tax Invoice that the customer has already paid ......)

The Credit/Adjustment Note should have the same Items & their quantities as the original tax invoice that you generated.  The nature of the Cr/Adj Note is that it will decrease the Item quantities & linked income accounts accordingly.

In turn, you should receive a credit or refund from your supplier for these Items which will reflect in the Item's (COGS or Expense) cost calculation.