Debit note in tally

Dear Friends

X purchased 5 units from Y.

Now he wants to return 2 units to Y so he issues debit note.

now when X tries to enter debit note in Tally, Tally asks reasons for issuing Note wherein it outlines many options out of which one option is sale return.

But this is infact purchase return for X and not Sale return.

Why has tally given sale return as one of options and not given purchase returns as a valid option.

Another query is that Tally is asking Supplier Debit/Credit No. while entering debit note.

Now does this mean that before X returns goods to Y, he has to ask for Credit Note from Y before he makes purchase return and quote that Credit Note No. while generating his debit note in tally.

Please reply to both the queries.

Regards

Shivani