This is a Boolean attribute to set an account as enabled or disabled in IdentityNow. You can add the IIQDisabled attribute in the source account schema or use the Build Map Rule to set the value as true/ false based on the incoming data from the file. For more information, refer to the IdentityNow Rule Guide.
Does the Delimited File Connector require that ALL fields within the file be in the schema to aggregate the file? There is no documentation of this, but it seems to error when attempting to load a file with additional fields. I don’t recall if this is intended or not and it is not documented anywhere.