SNC PO Schedule line changes after confirmation

Hello,

Here is a strange issue that we are having. In PO line item (in ECC) the schedule lines are like below

Schedule line ID     Quantity

1                              100

2                              200

3                              300

It goes to SNC and user opens this PO.. all looks ok. After clicking on change , Confirm (PO item) , Save and then Publish. The data reflected on ECC is in reversed order. But the confirmation tab has the same old sequence.

Schedule line ID     Quantity

1                              300

2                              200

3                              100

Has anybody seen this issue? Any suggessions?

PS: There are no user exits or BADIs for any custom logic for processing all the interfaces between ECC - SNC.

Thanks,

Amit.