Conditional load of records in Datastage

Add a third output link and make the filter condition as negation of first output link and reject link. All the records that do not match the filter condition of first output or filter condition of reject would be passed to the third link.

In the transformer Stage Constraints we can define the constraints where this records can get to which link so that the missing records can get catched.

You can choose O.W option in constraints, so remaining records you will get.