-20433 AN UNTYPED EXPRESSION WAS SPECIFIED, BUT AN ASSUMED DATA TYPE CANNOT BE DETERMINED FROM ITS USE
Explanation
An untyped expression was specified and DB2® cannot determine the data type. This error can occur with a MERGE statement when an untyped expression like a parameter or the NULL keyword is specified for a column of the source data, and the column of the source data is referenced in multiple contexts with different assumed data types.
System action
The statement cannot be processed.
Programmer response
Specify an explicit CAST specification to provide the correct data type for the expression.
SQLSTATE
429C1