Hello
This is a deadlock that happens when system is trying to update the plannning file (table MDVM).
Firstly, you to check the following note, which describes the most common causes for oracle deadlocks:
84348 - Oracle deadlocks, ORA-00060
Also, check if there is any other application running in parallel with the MRP.
You should consider that the overall MRP planning process is without locking objects.
Development has designed it in that way to guarantee the mass update handling will million of data (planned orders, Purchase requisitions, dep. requirements, planning file entries, ...).
Locking objects is not feasible in the MRP environment because many users will not be able to continue with the data processing due to current locks.
Getting a deadlock situation during MRP is quite unusual because the programs update the data in a sorted way. E.g. process 1 update record A and B, process 2 update the data at the same time in
the same sequence -> It should avoid the deadlock.
Therefore, there may be some other program or application running at the same time than the MRP which disrupts the MRP data handling and causing the deadlock.
BR
Caetano