+331 THE NULL VALUE HAS BEEN ASSIGNED TO A HOST VARIABLE OR PARAMETER BECAUSE THE STRING CANNOT BE CONVERTED FROM `source-ccsid` TO `target-ccsid`. REASON `reason-code`, POSITION `position-number`

Explanation
 A string had to be converted from source-ccsid to target-ccsid 
and an error occurred during the conversion. The position-number,
if provided  (non-zero), is the ordinality of the host variable or
parameter in the SQLDA. See the  description of SQLCODE -331 for further
information including the meaning of the  reason-code.

System action
 The host variable is unchanged and its indicator
variable is set to -2 to indicate that a null value is returned. Execution
of the statement continues as if the conversion error had not occurred.

SQLSTATE
 01520 

+331 THE NULL VALUE HAS BEEN ASSIGNED TO A HOST VARIABLE OR PARAMETER BECAUSE THE STRING CANNOT BE CONVERTED FROM source-ccsid TO target-ccsid. REASON reason-code, POSITION position-number

Explanation

System action

SQLSTATE

+331 THE NULL VALUE HAS BEEN ASSIGNED TO A HOST VARIABLE OR PARAMETER BECAUSE THE STRING CANNOT BE CONVERTED FROM `source-ccsid` TO `target-ccsid`. REASON `reason-code`, POSITION `position-number`