Material Master settings for RPM component &1 &2 are unsuitable for ATP.

What causes this issue?

Some components are not set up correctly for an ATP check.

System Response

The system overrides the incorrect settings and executes an ATP check -
the resulting confirmation is considered to be valid only by RPM
orders.The RPM component reservation is invisible for all other ATP
checks.

How to fix this error?

Assign an ATP group for which advanced ATP has been activated.
Assign an MRP type that is appropriate for RPM components.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.