Purchase requirement with duplicated lines

Hi,

We have a few cases reported by the business users where in the MTO (Make to order) scenario, the material in the sales order with item category TAB was duplicated in ME23n.

In the sales order schedule lines (with quantity 1), you can see that there is one PR number created against that material. But when you look at the PR in ME23n, we can see that the line item appears twice in that PR (2 line items for the same material with 1 quanity each).

Can you please let me know how this line was duplicated in the PR?

Thanks!!!