Enter a material

What causes this issue?

The material number is necessary for document selection.

System Response

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

How to fix this error?

Enter a material number (it is possible to enter an interval).
If you do not know the material number, press F4 to search for it.

Error message extract from SAP system. Copyright SAP SE.