database deadlock

hi,

this is ali i am getting the following error due to that deadlock will accoring

DBIF_RSQL_SQL_ERROR

The database system detected a deadlock and avoided it by rolling back

The termination occurred in the ABAP program "SAPLDISP" in "UPDATE_MDVM".

The main program was "RMMRP000 ".

my environment is

Operating system......... "HP-UX"

Release.................. "B.11.11"

Hardware type............ "9000/800"

ORACLE 9.2.0..

Patch level.............. "196"

please some hlep me out with this night mare