Backorder release of a single line updates Scheduled Pick Date of all lines

Hi,

I have the following scenario in 9.1 (code current 2015) that I'm not sure is working correctly or not.

I have SO 123456 with five items with following attributes:

All items are shippable except one line, which is on backorder.

None of the lines have been picked yet.

All lines have the same Scheduled Pick Date (in customer example, it is a past date, e.g. 1st April).

All lines are on the same shipment (7890).

I proceed to release the one line off backorder via R42118 - proc opt set to perform commitments. Upon checking the following has occurred:

1. Line was released off backorder as expected.