Hi
For MB51 check SAP Note 357187 - MB51: Fields in field catalog / selection screen, about how to hide fields.
The other are LIS reports. Create a customer LIS using the former LIS as a template without these fields.
Manage with auth.objects what tcodes can be viewed by the end user.
See also Note 690027 - FAQ: Reporting IM (no LIS)
Regards
Eduardo
