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Pulp lacks the ability to perform dependency solving at a module level and to copy dependent modules and their artifacts during recursive copy operation.

It's important for modules to have all their artifacts present in a repo.
Regardless of the depsolving strategy for RPMs, all module artifacts and related modules should be copied to a target repo. 
E.g if the target repository already contains units newer than a module requires, the module-required units need to be copied in the older version, in addition to the already present units.

Modules may depend on other modules, either for the build- or the run-time. 
https://docs.fedoraproject.org/en-US/modularity/making-modules/defining-modules/#_advanced_dependencies_optional.

Pulp should perform dependency solving based on runtime dependencies only.

The Pulp upstream bug status is at POST. Updating the external tracker on this bug.

The Pulp upstream bug priority is at Normal. Updating the external tracker on this bug.

The Pulp upstream bug status is at MODIFIED. Updating the external tracker on this bug.

All upstream Pulp bugs are at MODIFIED+. Moving this bug to POST.

Should this ticket explicitly include module errata as well? Or was that intentionally left out of the description?

The Pulp upstream bug status is at ON_QA. Updating the external tracker on this bug.

The Pulp upstream bug status is at CLOSED - CURRENTRELEASE. Updating the external tracker on this bug.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1454