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The function will only return an instanceId when the actual returned instanceId is an existing instance in the actual data base. 
When the actual instanceId is not a valid id, these functions will fail, return the value xpxNULLID and throw an exception.

                                           
FUNCTION xpfIntegerToInstanceId (value      : INTEGER)
                                 instanceId : GENERIC;

FUNCTION xpfStringToInstanceId (stringValue : STRING)
                                instanceId  : GENERIC;