-240 THE PARTITION CLAUSE OF A LOCK TABLE STATEMENT IS INVALID

Explanation
 The LOCK TABLE statement is invalid for one of
the following reasons:  
If it is partitioned, specify a PARTITION clause
that  identifies the partition you want to lock.

System action
 The LOCK TABLE statement cannot be executed.

Programmer response
 Determine whether the specified table resides
in a partitioned table space defined with LOCKPART YES.  If it is partitioned and defined with LOCKPART YES, specify a
PART clause that identifies the partition you want to lock.
If it is partitioned but does not have the LOCKPART YES attribute
and you want to lock a single partition, use ALTER TABLESPACE to change
the LOCKPART attribute to YES.
If it is not partitioned, do not specify the PART clause.

SQLSTATE
 428B4 