-401 THE DATA TYPES OF THE OPERANDS OF AN OPERATION ARE NOT COMPATIBLE

Explanation
An operation
cannot be processed for one of the following reasons:The data types of the operands must be compatible but at least
one pair of data types is not compatible.
An operation contains a mixture of numeric and non-numeric operands.
One of the operands is a column defined with a field procedure,
and another column operand is not defined with the same field procedure.
If one column of arithmetic or comparison operation is defined with
a field procedure, other columns in the operation must be defined
with the same field procedure.

System action
 The statement cannot be processed.

Programmer response
 Check the data types of all operands to
ensure that their data types are comparable and compatible with their
usage in the statement.
 If all the operands of the SQL statement
are correct, then, if a view is being accessed, check the data types
of all the operands in the view definition.

SQLSTATE
 42818