SAP and Project specific Purchase Orders

Hi all that endure SAP,

My company has adopted SAP at large,
but the engineering division (that I belong to)
has this problem.

Purchase orders are numbered chronologically
for the entire company
regardless the specific project they are
devoted to.

This of course makes it impossible for PM
to make sure his project’s list of PO is exhaustive,
since he will lack certain chrono numbers anyway
(devoted to others projects, but issued concurrently).

Is any of you guys familiar with this pb
and did you find a workaround?

Thanks in advance for your insight