Allow to create a purchase order with purchase requisiton item deleted

Dear all,

I have a question about creation purchase order process.

Firstly, I have a purchase requisition with 2 items, first of them is deleted.

If I try to create a purchase order thru transaction ME57N with the previous purchase requisition, I can only create it with one item (the one wich is not deleted)

However, if I try to create the purchase order thru transaction ME21N, with purchase requisition as reference, I can create the PO with item that was deleted in PR.

I don't understand why system allows to create a purchase order with an item that previously was deleted in PR.

Does anyone have a explanation about this issue?

Many thanks in advance

Best Regards.