SAP Message 29021 - You are not authorized for this reference

Diagnosis
Your profile contains details of which BOM transactions you are allowedto carry out, according to BOM category. This authorization is definedfurther in your user profile, via combinations of field values for BOMusage and authorization group.
Your current profile does not authorize you to use the selectedalternative of the reference.

Procedure
Consult your system manager responsible for authorizations. The valuerange in your user profile may need to be changed.
If no change is planned, inform your system manager for BOMs.