Received an email from the LA Department of Revenue that doesn't exactly answer the question but appears to contradict what you said, which is why I asked the question.  What answer is correct?

Per R-6922 Instructions:

WHO MUST FILE

Partnerships engaging in activities in Louisiana that have nonresident partners are required to file a composite partnership return unless;

1. All nonresident partners are corporations, partnerships, or tax exempt trusts; or

b. All nonresident individual, estate, and trust partners have a valid agreement on file with the Department of Revenue