Upgrade from ECC 6.0 EHP5 to EHP7 issue with PO header

HI Experts,

We  Upgrade the  Ecc 6.0  recently  from EHP 5 To EHP 7. In EHP 5 when we select the PO type  (REW - Reject ) in ME21N , Reject tab will appear at header level.
In EHP 7 When we enter the PO type (REW - Reject ) in ME21N ,Reject tab will not appearing and  it is asking for the organisation elements  and vendor .After entering the all the organisation data only reject tab appear in header level.
My client wants EHP 5 Functionality in EHP 7.What clould be the reason to behave like this.How to achive this requirement.

Regards,
Venkat.