Can we lock the reservation while entering GI ?

Can we lock the reservation while entering GI (like the PO is locked while entering GR)?
Steps that made a problem.
1. User A enter MIGO and key GI ref. reservation. (Not save yet)
2. User B enter MIGO and key GI ref. the same reservation.
3. Both of them save the materail document.
Then stock was double issued.
The problem happens when the system was slow too. User A enter GI ref. reservation and save it. The system has not finished updating. User A cannot see the material document, so he thinks the update was unsuccessful and enters it again.
I think if we can lock the reservation while entering GI, it will solved this problem.
If you know how or have another idea, please suggest me.

dbuser wrote:
I am using the Oracle 10g and I have question related to "for Update" clause.
We have the data warehouse db, so no foreign key constraint between parent and child.This is the mistake: you need the foreign key constraint. It is vital to have these in a data warehouse. You need as many constraints as possible: they give information to the optimizer, without which the optimizer has no chance of developing efficient execution plans. Remember that constraints are not only about data integrity, you need them for performance as well.
John Watson
Oracle Certified Master DBA
http://skillbuilders.com

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