3538 A MultiLoad UPDATE Statement is Invalid.
The user has provided an UPDATE statement in a MultiLoad Complex Import Task that does not fully specify a primary index value, does not fully specify the values of all the partitioning columns, or modifies the primary index or partitioning columns.
Correct the error and resubmit the request. The WHERE condition, including any taken from a view definition, must allow for primary index access (and, if partitioned, partition access) with possible ANDed residual conditions. The list of updated fields must not include any column in the primary index or partitioning expression, and only one table may be referenced.