Converting Multiline Multi Year requisition to Contract PO - Distribution not picking relevant gl da

We are creating a requisition with multiple lines, one for each year to create a multi year contract. Each of these 3 lines have been given a GL date for respective year. When converting this to Contract, the PO distribution is not picking requisition line GL date

For example

Line GL DATE

1 29-Oct-2915

2 29-OCT-2016

3 29-OCt-2017

Convert to PO. PO Distributions are created where Encumbered date for all the 3 lines is sysdate and not the date mentioned in requisition.

Please advise if this is expected behavior ?

Having procurement team change encumbrance dates manually for contracts is not feasible and prone to errors.