Activation of business function is not allowed

What causes this issue?

Business functions IS_AD_MPN or MGV_LAMA are switched off in the source
system before conversion. Following the conversion to SAP S/4HANA, you
tried to activate these business functions.
In the SAP S/4HANA system, for LAMA and MPN functionality to work, these
business functions need not be activated.

System Response

There is inconsistency between MARA and MATERIALID table. Activation of
business functions is not allowed. If activated, these can cause
inconsistency in the behavior of certain transactions.

How to fix this error?

In case you need to activate these business functions, contact SAP by
raising an incident in the component IS-A-LMN with the text "Activation
of business functions IS_AD_MPN or MGV_LAMA "

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.