C form in case of debit/credit note in same qtr & diff qtr

What amt of C form should issued by purchaser if purchase of Rs 10000 in jan

1) issued a rate difference / quality issue debit note of Rs 1000 in Mar.

2) if issued a rate diff/quality issue or any other type of debit note of Rs 1000 (related to jan purchase) in jun.

if Purchaser issued a C form for 9000 in both cases. Is he right?

What is the book rule  & what can be done to solve the issue?