Please enter data for the material group material

What causes this issue?

You have defined the material group materials as mandatory entries in
the global settings in Customizing.

How to fix this error?

If you do not want material group materials to be defined as mandatory
entries, you must reset the corresponding indicator for
<DS:SIMG.W_GE_0100.SIMG_ORAL>General control of master data</> in
Customizing.
INCLUDE ISR_CUSTOMIZING

Error message extract from SAP system. Copyright SAP SE.