Does the Stakeholder Management Plan or the Communications Plan house the SH communication requirements?

This is why I ask. Please clarify.

We were told repeatedly that the Stakeholder Register does not contain the Stakeholder Communication Requirements as that is covered specifically in the Communications Plan.

However, in the PMBOK on page 403, it states the Stakeholder Management Plan covers 'Stakeholder communication requirements for the current project phase." That statement and the bulleted items after that are a conflict. Please explain.

Always be ready for Stakeholder Management Plan in the future. - Steven C Wyer