Custom Constituent Imports do not directly interfere with Luminate Web Services. One thing to be aware of, however, is that collisions can occur if the record is modified by any process while web services is attempting to update the same constituent during a web services sync window. In these scenarios, you can choose to have web services always win by setting the Force parameter to true in your request.

Internal notes: Luminate web services does not use the datasync_date field on a constituent's profile, so the SDP DATASYNC_SSI_TYP does NOT need to be set to "with_sync" to prevent issues with Custom Constituent Imports.