Saad,
SAP had disabled some functionality related to hierarchical access in pricing. If you are not on a specified support package (for EhP5 that would be SP08), then you will receive this error. Per SAP Note 1600482:
Until the Required Support Package level is applied to your upgraded system, pricing and condition technique will abort with the run-time error "support package level not sufficient".
I would check the following:
1. Check what Support Pack your on
2. If it's lower than SP08, then check and see if you have applied notes 1599403, 1600091, 1601052 and 1601120. If you have, then SAP is recommending you deimplement these notes.
3. If you haven't or are on a higher release, then submit an SAP message under the component XX-PROJ-IMS-HA.
Please read SAP Note 1600482 thoroughly as well.
Thanks,
Todd