When creating a material reservation or requisition via the PM order, the G/L
account is defaulted by the automatic account assignment in the material master.
The default G/L can be changed for a material requisition on the purchasing
data screen.
How / where do you change the default G/L for a reservation?
A manual update is not allowed to a reservation that has been created via a
PM order.
Other companies are having the same problem.
Currently, the only way to do it is doing a manual goods issue, without using
the reservation.
In this way you can, of course, change the default G/L account.