Spouse contact information in enhanced NXT imports

For GiveCampus integrations and API.

The enhanced spouse import uses spouse record IDs to build a relationship and draws contact values from the mapped spouse person's CRM data. This does not confirm that a nonconstituent spouse's contact fields on a shared RE constituent record automatically become alternate emails/phones of the primary GC constituent. Identify the actual RE relationship/contact representation before proposing a mapping. Do not invent a Spouse Email mapping option or merge people solely to make an email match.